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How to fix S8 random reboot issue

How to fix Samsung Galaxy S8 Plus that keeps randomly rebooting on its own [troubleshooting guide]

Does your #GalaxyS8Plus restart on its own lately? Today’s troubleshooting article will address this issue. You have to remember that this type of problem can be caused by different factors. We discuss what these factors are and how you’re going to handle them.

Before we proceed, we want to remind you that if you are looking for solutions to your own #Android issue, you can contact us by using the link provided at the bottom of this page. When describing your issue, please be as detailed as possible so we can easily pinpoint a relevant solution. If you can, kindly include the exact error messages you are getting to give us an idea where to start. If you have already tried some troubleshooting steps before emailing us, make sure to mention them so we can skip them in our answers.

What causes random restart issue on your Galaxy S8 Plus

There’s a number of reasons why your Galaxy S8 Plus may be restarting by itself. These factors can vary in each of the case but so far, these are the common ones that we usually encounter:

  • Rogue app/s
  • Low/insufficient RAM
  • overheating
  • Inefficient app or Android coding
  • Unknown software bug
  • Bad battery
  • Water damage, exposure to cold
  • Hardware damage or malfunction

In order to effectively isolate which of these items is causing your issue, you need to know the history of the device and perform troubleshooting steps. Knowing your device’s history is a critical step because it can save you time, effort, and avoid the hassles of doing drastic but unnecessary solutions such as factory reset or repair. For example, if your S8 Plus had been working fine for weeks and the issue suddenly occurred coincidentally after installing your, say, favorite new game, it’s possible that said app may be to blame. Uninstalling it may save you time and effort instead of going through the rest of the troubleshooting steps in this guide. If your S8 only became problematic after you accidentally dropped it, there’s high likelihood that you may have damaged some components. In this case, it’s probably better to simply skip the software troubleshooting and go directly to sending the device in to Samsung.

If you can’t seem to know where the issue comes from though, you can start following the set of troubleshooting steps we provide below.

Force restart

Before you start doing any drastic solution options, keep in mind that some bugs, including some cases of random restart cases, are fixed by simply doing a force restart or soft reset. On devices with removable battery packs, this is done by disconnecting the battery from the device itself. However, in your case, you can only do its virtual equivalent by doing these steps:

  1. Press and hold the volume down button and don’t release it.
  2. Then, press and hold the power key while holding down the volume button.
  3. Keep both keys held down for 10 seconds or more.

Afterwards, observe your phone and see if the issue goes away. If it still remains, then go ahead and create a copy of your files, and follow the rest of the troubleshooting guide.

Create a backup of your personal data

Making a backup of your files should be your next priority in this case. It’s an imporant step to prevent data loss. This guide will touch on a number of possible causes and solution and one of them will ask you to wipe the device clean. While you still can, be sure keep your data intact in another device, or to a cloud service.

We won’t know how often your S8 Plus will restart by itself, or how much time you have between reboots but regardless, make sure that you don’t skip this suggestion.

In creating your backup, try to use Samsung’s official backup tool called Smart Switch. It’s an excellent tool if you want to keep virtually everything on your phone. If you don’t want to keep your backup in a computer, you can opt to save them in the cloud. Samsung does offer a limited GBs of free cloud services so try that first. Alternatively, you can use third party cloud services like Dropbox, Microsoft’s OneDrive, or Google’s own cloud service.

Clear cache partition

Now that you’ve already created a copy of your personal files, the first step to resolution is to ensure that you clear the cache partition. This is where Android keeps the system cache that is uses to load apps quickly. At times, installing updates or apps may corrupt this cache. By clearing the cache partition, you are basically deleting the system cache. Don’t worry, this cache will be rebuilt by the system over time so there’s no need to worry about losing anything.

To clear the cache partition on your S8 Plus:

  1. Turn off the device.
  2. Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
  3. When the green Android logo displays, release all keys (‘Installing system update’ will show for about 30 – 60 seconds before showing the Android system recovery menu options).
  4. Press the Volume down key several times to highlight ‘wipe cache partition’.
  5. Press Power button to select.
  6. Press the Volume down key until ‘yes’ is highlighted and press the Power button.
  7. When the wipe cache partition is complete, “Reboot system now” is highlighted.
  8. Press the Power key to restart the device.

Observe in Safe mode

Sometimes, rogue, malicious, or incompatible apps may be added into a system. This usually occurs if a user is not mindful of what apps to install and from where they are coming from. If you’re adventurous when it comes to apps, there may come a time that you’ll encounter problems from one of them. To check if one of your apps is indeed behind the trouble, you need to restart your S8 Plus to safe mode and observe. Safe mode only allows pre-installed apps so if your device works normally and won’t restart on its own, that’s a clear yes to our suspicion.

To restart your S8 to safe mode:

  1. Turn the device off.
  2. Press and hold the Power key past the model name screen.
  3. When “SAMSUNG” appears on the screen, release the Power key.
  4. Immediately after releasing the Power key, press and hold the Volume down key.
  5. Continue to hold the Volume down key until the device finishes restarting.
  6. Safe mode will display in the bottom left corner of the screen.
  7. Release the Volume down key when you see Safe Mode.

If the problem seems fixed while in this mode, the next thing you should do is find the app that’s causing the problem and uninstall it. However, if the problem still manifests while in this mode, then try doing the next step.

Force quit all apps

If your device seems to restart only in random, without any discernible pattern to it at all, it’s probably just running out of RAM. Android is supposed to manage memory on its own but  there are some cases when this mechanism fails. You may need to intervene in these instances to help the system. There are two ways to do this. The first one is to close all apps by pressing the Recent button, the one on the left side of the Bixby key, and then tapping on CLOSE ALL button.

The other method is by doing these steps:

  1. Open Settings app.
  2. Tap Device maintenance.
  3. Tap Memory.
  4. Tap CLEAN NOW button.

We suggest that you do both methods.

Install app and Android updates

Sometimes, the most effective solutions are the simplest. In your case, the most effective way to fix the problem may be to simply install updates. Incompatible apps and outdated Android version may potentially lead to problems. To minimize that situation from happening, always ensure that you everything is up-to-date. This means installing updates for both apps and Android. If you have apps from non-Play Store sources, be sure that they are compatible with the current Android version you have.

Overheating

if you noticed that your S8 Plus becomes uncomfortably warm after using it for some time, it may be overheating. Be design, your S8 device is supposed to shut itself down when its core temperature reaches a certain limit. This is to ensure that the hardware is not damaged further by sustained heat buildup. So, if your S8 tend to heat up first before turning itself off, the hardware must be overheating for some reason. Oftentimes, this signals a hardware malfunction in the making but it can also very well be due to a software bug. make sure to continue the rest of the software troubleshooting below so you’ll know whether or not you have a software- or a hardware-related problem.

Check for water damage

The presence of water or liquid in the charging port can sometimes complicate things for devices like the S8 and S8 Plus, which have water resistance protection. In some cases, overconfident owners may decide to test out the limits of their phones by intentionally dunking their device in water. If you’re one of them, there’s a chance that your phone may have been water damaged. Your S8’s water resistance protection is not perfect so if there’s enough pressure applied to the charging port or to the sides, water may be able to penetrate weak spots. Water and electronics obviously don’t mix very well so if your s8 started acting up after getting it wet, you may have a possible hardware malfunction. To check for water damage:

  1. Look into the USB port to find any traces of moisture.
  2. Regardless whether there’s moisture in there or not, it’s better that you clean it up to get rid of any foreign materials that may cause more complications.
  3. Use a cotton swab to clean around the area or insert a piece of tissue paper to absorb the moist.
  4. Now check the Liquid Damage Indicator (LDI) to know if it’s tripped or not.
  5. Remove the SIM card tray and look into the SIM slot.
  6. If the LDI is still white, your phone is free of liquid damage but if it turned red or purple, it’s positive that water or any sort of liquid found its way into your device.

If you suspect that water may have gotten inside the phone, turn off the phone and send the device to Samsung for repair. Keep in mind that water damage is not covered under their warranty terms so even if the device is still within the warranty period, you’ll still probably end up with a hefty repair bill afterwards.

Reset all settings

Some users were able to fix random restart problems by resetting the device’s settings. This option has a similar effect to factory reset, without the hassle of deleting your personal data.

To reset the settings on your S8 Plus:

  1. Open Settings app.
  2. Tap General management.
  3. Tap Reset.
  4. Tap Reset settings.
  5. Tap RESET SETTINGS button.
  6. Restart your S8 and check for the problem.

Factory reset

To check for the possibility that there may be an unknown software bug causing your problem, you can do a factory reset. We know that factory state software does not have this issue so we hope that factory reset will help.

To factory reset your S8:

  1. Turn off the device.
  2. Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
  3. When the green Android logo displays, release all keys (‘Installing system update’ will show for about 30 – 60 seconds before showing the Android system recovery menu options).
  4. Press the Volume down key several times to highlight ‘wipe data / factory reset’.
  5. Press Power button to select.
  6. Press the Volume down key until ‘Yes — delete all user data’ is highlighted.
  7. Press Power button to select and start the master reset.
  8. When the master reset is complete, ‘Reboot system now’ is highlighted.
  9. Press the Power key to restart the device.

Contact Samsung support

If all the software solution options won’t help solve the problem, that’s an obvious sign that you have a possible hardware issue. The common hardware failures that lead to a phone to randomly restart includes a bad battery, a damaged power management IC, broken charging port, or a general malfunction of the logic board. To fix your issue, be sure to seek professional help from Samsung.

 


Engage with us

If you are one of the users who encounters a problem with your device, let us know. We offer solutions for Android-related problems for free so if you have an issue with your Android device, simply fill in the short questionnaire in this link and we will try to publish our answers in the next posts. We cannot guarantee a quick response so if your issue is time sensitive, please find another way to resolve your problem.

If you find this post helpful, please help us by spreading the word to your friends. TheDroidGuy has social network presence as well so you may want to interact with our community in our Facebook and Google+ pages.

How to fix Galaxy S8 update issue: won’t turn back on after installing an update

Hello Android fans! Today’s troubleshooting article answer some issues for the #GalaxyS8. We have been getting update-related problems for this device recently so we include some of the cases here. We hope you’ll find the post helpful.

If you are looking for solutions to your own #Android issue, you can contact us by using the link provided at the bottom of this page. When describing your issue, please be as detailed as possible so we can easily pinpoint a relevant solution. If you can, kindly include the exact error messages you are getting to give us an idea where to start. If you have already tried some troubleshooting steps before emailing us, make sure to mention them so we can skip them in our answers.

Problem #1: Galaxy S8 Plus goes into boot loop after an update

Hello. I’m with a problem in a S8+ (955U1). Since its with the last update firm-XAA version and theres a bootlooping problem, crashing apps.. I’ve tried everything on hard reset and flash all over with sammobile stock roms.. but the problem persists.. the same issue appears no matter firmware carrier I flash. I’ve tried XAA, XAS and ATT last firms.. I’m in Brazil and there’s no warranty here..Please Help me #fail to open recovery_cause(No such file or directory)# #Reboot Recovery Cause is [UNKNOWN]# Support SINGLE-SKU File-Based OTA Supported API:  3 # MANUAL MODE v1.0.0# remove failed dir ‘/system/carrier/ATT/priv-app/AttIqi_ATT’ (No such file or directory) E: [libfs_mgr]Error fetching verity device number: No such device or address E: [libfs_mgr]Couldn’t get verity device number! E: [libfs_mgr]Error removing device mapping: No such device or address Successfully verified dmverity hash tree.

Solution: Flashing different stock ROMs from other carriers will naturally cause boot loops. There’s a reason why carrier firmware are labeled differently. You should only try to flash stock firmware designed for your particular phone model. Using a different one, like flashing an AT&T version to a T-Mobile device can lead to problems, one of them being boot loop. If you’ve already tried to flash the stock ROM that originally came with the device and that did not work, you’re out of luck. The reason for the boot loop probably goes beyond incompatible firmware. Its partitions may had been corrupted, or there may be a hardware malfunction. Try to bring your device to an independent service center if there’s no nearby Samsung store.

Problem #2: Galaxy S8 No network available error after charging port replacement

I have a Samsung Galaxy S8 that I had taken to Gearvana phone repairs in Adrian, Michigan and they did a charger port replacement on Sept. 8, 2018.  After I got the phone back it didn’t work. It had a “no network available” error when I tried to use it. I took it back to them and they had no clue.  So I took it to Sprint my carrier in Adrian, Michigan and they said the SIM card seems okay and that I should take it back to Gearvana to have them replace the antennas, which they did.  The phone still does not work. I took it to the Sprint repair in Jackson, Michigan and they said it is probably the board and not worth fixing to see what Gearvana would do about it because they probably broke the phone. I took it back to Gearvana and they said the Samsung Galaxy S8 is noted for the “no Network Available” error.  The phone has been looked at several times and no one seems to be able to fix it. I am retired and on a fixed income and cannot afford to put any more money into the phone. It already cost me $100.00 to have the charger port replaced and now the phone doesn’t work at all. I have a lot of health issues and my doctor’s call me on this cell phone.  Please help? Thank you.

Solution: While letting third party shops do the repair can be cheaper compared to Samsung repair, there’s sometimes no guarantee that everything will work out fine afterwards. What happened to you is unfortunate but the only hope you have right now is to force the issue with the shop that did the initial repair. If you are positive that your phone’s network functions were working prior to the charging port replacement, then the technician who performed the procedure must have messed up with the hardware.

No network available error can be a sign of a SIM card issue, software glitch, or hardware malfunction. If you’ve already tried wiping the phone thru factory reset before contacting us, then the most likely reason is bad hardware. The technician may have damaged the antenna or another chip during the repair. Issues of this kind may only be fixed by replacing the damaged part, or by installing a new logic board altogeher. Getting a new motherboard is impractical as it can cost more than half the price of a brand new device. Your only hope now is to convince the repair shop to take your phone in again and repair it for free.

Problem #3: Galaxy S8 freezing and restarting on its own after installing an update

Hi. so i recently updated my S8 and within the next hour it started to freeze and restart on its own..the interval kept on decreasing and now it freezes every few seconds if i do any multi-tasking or open multiple tabs. Now i tried all the basic solutions (didn’t work)..took it to samsung service center and the guy said “your motherboard is done.” (Also: He didn’t open the set…just did some updates with Odin didnt work and so he came back saying it’s a motherboard issue)

Question: should i take his word or do you suggest there is any alternatives i try before making any further move?? And just so you know…i can access every thing in the set but freezes if overloaded with tasks. Hoping to hear from you!

Solution: If the Samsung representative you talked to was a qualified technician (and not a sales agent), then you should probably take his word. After all, he did try to physically check the device and run some tests to check the software.

If you want to see if the problem is fixable on your level, you can attempt to downgrade Android to its previous known working version. You can do that thru Odin. By flashing the previously working Android, there’s a chance that the hardware may be relieved of the pressure from the new OS. While Galaxy S8 can work with the latest available version of Android (Android 8) as of this writing, there may be a peculiar bug that causes it to get overwhelmed when running multiple tasks. We haven’t heard of this issue happening in other S8 devices so we want to say this may be an isolated case.

If you want to give flashing a try, use Google to find a good guide for the steps. Keep in mind that flashing is risky and can permanently damage the software environment of your device. Do it at your own risk.

Problem #4: How to fix a Galaxy S8 that stopped turning back on after installing an update

My S8 was working fine however starting a few weeks ago it would turn off suddenly at random times with plenty of charge. Normally I would be a able to turn it straight back on or if that didn’t work plug it in to a charger then turn it on. For the past couple of days straight after I updated it my phone hasn’t been able to turn on at all and when I plug it in to charge it, it shows it is charging but just doesn’t turn on.(I’m guessing it’s at the latest android version as I just updated it this week).

Solution: If your S8 no longer turns on right now, you should treat the issue as such and follow solutions for it. No Power or Won’t-Turn-on issue can be caused by a software glitch or hardware-related problem. In some cases, the cause is obviously a hardware glitch so no software troubleshooting is necessary.

In your case, since the device was still working properly before it stopped turning on for good, there’s a chance that the cause may be software in nature. To see if that’s the case, make sure to do these troubleshooting steps:

Use another set of charging accessories

Like the main device itself, charging cables or adapters can go bad sometimes. If possible, try charging your phone using another set of official Samsung USB cable and adapter. Be sure to leave the phone charged for at least 30 minutes before turning it back on.

Try wireless charging

The Galaxy S8 can charge wirelessly. To bypass any possible issue with the charging port, using a wireless charging is a good idea. If you don’t have a wireless charger, try to bring the device to a Samsung store so you can borrow one from there and use it to charge your S8. If your phone will turn on, that means there may be an issue with its charging port. To fix it, you must send the phone in for repair.

Check for possible screen issue

Sometimes, a bad screen issue can be mistaken for No Power issue. The latter is indicated by total loss of power and no sign of life — no sound, no LED light, no vibration. If your phone’s screen remains black but otherwise alive and making a sound, showing LED light, and/or vibrating, the most likely issue is a bad screen assembly. In this case, you want to have the device repaired.

Boot to alternate software modes

Sometimes, Android may encounter a bug it can’t recover from causing boot problems. This means that while the phone may appear dead, it’s simply unable to boot up normally. At times, such a situation can be fixed by booting the device to Recovery Mode so a cache partition wipe or master reset can be performed. To check:

  1. Turn off the device. This is important. If you can’t turn it off, you’ll never be able to boot to Recovery Mode. If you are not able to shut the device off regularly via the Power button, wait until the phone’s battery is drained. Then, charge the phone for 30 minutes before booting to Recovery Mode.
  2. Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
  3. When the green Android logo displays, release all keys (‘Installing system update’ will show for about 30 – 60 seconds before showing the Android system recovery menu options).

If you are able to turn the phone on to Recovery Mode, there’s high chance that the problem can be fixed on your level. If the phone remains off though, consider repair or replacement  by calling Samsung.

 


Engage with us

If you are one of the users who encounters a problem with your device, let us know. We offer solutions for Android-related problems for free so if you have an issue with your Android device, simply fill in the short questionnaire in this link and we will try to publish our answers in the next posts. We cannot guarantee a quick response so if your issue is time sensitive, please find another way to resolve your problem.

If you find this post helpful, please help us by spreading the word to your friends. TheDroidGuy has social network presence as well so you may want to interact with our community in our Facebook and Google+ pages.