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How to fix Galaxy S9 random restart issue

What to do if Galaxy S9 restarts on its own while inside the pocket

Today’s post talks about a certain problem that many Galaxy S9 users may have encountered: random restart. While not as severe as other issues, a device that restarts on its own can sometimes be annoying, especially if you don’t have any idea why. In this short guide, learn how to handle this issue by following our troubleshooting steps below.

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.

Problem: Galaxy S9 restarts on its own while inside the pocket

Hi. I have recently upgraded my Samsung from a s6 to a s9. I had the official Samsung clear view cover on the s6 and have purchased the same for the s9. When I am travelling with my phone in my trouser pocket, I will from time to time take it out, look at it and put it back in my pocket. The problem I am having is that on at least one occasion each time I travel, the phone restarts itself whilst in my pocket. I am using it in the exact same way as I was using the s6 so I don’t understand why this happening with this new phone.

Solution: There is no easy way to know what is causing your phone to restart automatically. You’ll have to work to identify the culprit. Let’s discuss the options that you can try below.

Check for overheating

Samsung Galaxy devices are designed to restart automatically when internal temperature reaches a certain level to avoid damage. If you tend to use your phone heavily while travelling, like streaming videos or playing games, and then putting it in your pocket shortly after, it’s possible that your phone may be overheating. Keep in mind that your S9 is a little computer but unlike its bigger cousins, it does not enjoy ventilation. Space in a smartphone is a luxury so any rise in temperature can easily spike inside. Certain tasks require heavy use which may lead to your phone’s motherboard reaching a certain heat threshold. This can trigger the mechanism that tells the system to shutdown or restart. If you noticed that your phone has become overly heated after using it, allow it to rest for at least 30 minutes by shutting it down.

Device may restart after an update

In order for new updates to be installed, your Android needs to restart. So, if your S9 happened to be downloading and installing system update while you were travelling, this may be the reason why it restarted on its own. Keep in mind that some firmware versions allow a user to set a schedule when a downloaded update can be installed. Try to check your phone’s update configuration under Settings menu to see if this is the reason for the unexplained restart. We don’t know the circumstances of your problem but this is worth checking. If your firmware provides an option for you to manually install an update of your own choosing, then we suggest that you use it to control when system updates are installed.

Bad system cache

Having bad or corrupted system cache can lead to all sorts of trouble although the main perceptible problem could be poor performance when loading apps. To minimize the chances of a corrupted system cache affecting the system negatively, we recommend that you wipe the cache partition at least once every few months. Doing so forces the device to rebuild the cache, which can be effective in getting rid of bugs.

To wipe the cache partition:

  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.

Temporary bug

Sometimes, this simple procedure can fix bugs that developed after the system has run for a long time. By manually forcing your Note8 to reboot, you’re basically simulating a battery pull, which, in older mobiles with removable battery packs, was an effective way to refresh the system. If you haven’t tried this one yet, here are the steps that you can do:

  1. Press and hold the Power + Volume Down buttons for approximately 10 seconds or until the device power cycles. Allow several seconds for the Maintenance Boot Mode screen to appear.
  2. From the Maintenance Boot Mode screen, select Normal Boot. You can use the volume buttons to cycle through the available options and the lower left button (below the volume buttons) to select. Wait for up to 90 seconds for the reset to complete.

Poorly coded apps

Apps sometimes affect Android and interfere with its functions. If there’s a  more likely reason for your problem, it’s a bad app. However, knowing what app may be the culprit is not easy. There’s no diagnostic tool available for us to directly know whether a particular app is the problem. The most that you can do is to use observation and process of elimination to identify. There’s also no way of knowing whether or not our suspicion that an app is the real reason and not any other factors. If you noticed that the problem started to occur after installing a new app, it’s a good idea to uninstall it to see if that will make a difference. Once you’ve done that, you can then try to replicate the problem. Again, we have no idea how you’re going to do this but if noticed that your S9 seems to restart in a particular location before, you can try to go there after uninstalling the suspected app. This troubleshooting step can become tricky though if you have a lot of apps to test out so it may be impractical for you to do.

Software bug

In case there’s an unknown software bug that causes the problem, you can wipe the phone with factory reset. Make sure to back your files up ahead of time.

  1. Create a backup of your data.
  2. Turn off the device.
  3. Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
  4. 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).
  5. Press the Volume down key several times to highlight ‘wipe data / factory reset’.
  6. Press Power button to select.
  7. Press the Volume down key until ‘Yes — delete all user data’ is highlighted.
  8. Press Power button to select and start the master reset.
  9. When the master reset is complete, ‘Reboot system now’ is highlighted.
  10. Press the Power key to restart the device.

Battery issue

We don’t have the full history of your device so we can’t say this for sure but one of the common reasons for random restarts is a bad battery. Since your S9 has non-removable battery pack, the only way to test our theory is by allowing Samsung to run some tests. If you think these restarts are bothersome and happens more often, you can contact Samsung so they can set up repair appointments for you.

 


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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.

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How to fix Galaxy S9 random restart: works for minutes before restarting on its own

Hello and welcome to another #GalaxyS9 troubleshooting article for the day. In this short post, we bring you another classic case of random restart issue. As usual, we also provide the solutions you can try on your end to fix it. Just remember, random restart issue has a hardware side as well. If all software solutions fail, you can assume bad hardware is causing the trouble.

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.

Today’s Problem: How to fix Galaxy S9 random restart: works for minutes before restarting on its own

Hello. my Samsung S9 keeps glitching… after it dies my Samsung turns on and then when I try using it it wont let me. It would turn on and then a couple minutes goes by and then goes off again. It’ll do this for more than an hour and then work like nothing happened. Is it possible a drink could’ve gotten into it and it f’ed it up??

Solution: The Galaxy S9 is a water-resistant device so it can’t be damaged by casual liquid or water splashes. The water-resistance protection in your device though can be compromised if there’s a physical break in the phone, like after dropping it, or if there’s a factory defect without you knowing it. Galaxy S9 devices with defective water resistance from factory is very rare and does not always result to problems unless a user swims or dives with the device. If you happen to dampen the device with liquid or drink before, all you have to do is to simply rinse it thoroughly with tap water to remove any residue. Once you dry the device properly, you can use it without any issues. So, we don’t think the reason for your main problem is due to water or liquid damage at all but probably a software or a deeper hardware malfunction.

To troubleshoot the device, follow our suggestions below.

Use another charging accessories

The first step is to ensure that the battery is charged properly. If it does not get the right amount of power before you turn the phone on, or if there’s an external issue charging wise, it may not work properly whenever it’s stressed by normal use. To see if there’s any issue with the current charging cable and adapter, try charging your phone with another set of accessories. If you can’t readily find an official S9 charging cable and adapter, you can do these things:

  • borrow them from a friend
  • use ones from your local Samsung store
  • use a wireless charger

Remember, your goal here is to check for the possibility of a charging cable or adapter issue. If nothing changes after doing any of the suggestions above, proceed to the rest of steps below.

Clear cache partition

If you can manage it, the next step that you want to do is to boot the phone to Recovery Mode and wipe its cache partition. This is one of the partitions in your phone’s storage device that keeps the system cache. Sometimes, updates and app installations cause this cache to get corrupted, in turn, causing all sorts of problems. To see if you have a cache problem, follow the steps below to clear the cache partition:

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.

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

Re-calibrate battery

Should nothing change after the system cache has been refreshed, the next step in your troubleshooting ladder is to recalibrate Android and the battery. Sometimes, Android may get inaccurate battery readings if the device is left running for a long time. It’s advised to regularly calibrate the battery to avoid having power problems.

  1. Drain the battery completely. This means using your device until it powers down by its own and the battery level reads 0%.
  2. Charge the phone until it reaches 100%. Be sure to use original charging equipment for your device and let it charge up completely. Do not unplug your device for at least two more hours and also don’t use it while charging.
  3. After the elapsed time, unplug your device.
  4. Restart the device.
  5. Use your phone until it completely runs out of power again.
  6. Repeat steps 1-5.

Observe in safe mode

One of the possible reasons for your problem may be an inefficient app, or even app-based malware. This is also one of the common reasons for a lot of Android issues. To check, restart the phone to safe mode and observe. If your S9 works normally and won’t reboot on its own, then one of your apps must be to blame.

Here are the steps on how to boot 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.
  8. Observe the phone while it’s on safe mode for at least 24 hours.

If the issue won’t happen when your S9 is on safe mode, bad third party app is behind it.To identify which of your apps is causing the trouble, you should boot the phone back to safe mode and follow these steps:

  1. Boot to safe mode.
  2. Check for the problem.
  3. Once you’ve confirmed that a third party app is to blame, you can start uninstalling apps individually. We suggest that you begin with the most recent ones you added.
  4. After you uninstall an app, restart the phone to normal mode and check for the problem.
  5. If your S9 is still problematic, repeat steps 1-4.

Factory reset

In majority of cases similar to yours, factory reset is the ultimate test to see if the cause is a software bug or not. It’s also the one way to know whether the issue is fixable on an end user’s level. Needless to say, you want to factory reset your S9 should all our suggestions above won’t help.

Factory reset wipes all user data so be sure to back your files up before doing it. We assume you create a copy of your irreplaceable data regularly but if you haven’t, try to back them up to a computer instead of uploading them to a cloud. Not only is a backup to a computer faster but it can also ensure that your S9 is being charged while it’s moving files. For a more efficient backup job, try to use Samsung’s own Smart Switch.

To factory reset your S9:

  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.

Get professional help

As an end user, there’s only so much that you can do to troubleshoot this issue. If your phone continues to show the same problem after a factory reset, this means the problem is probably deeper. It can be a bad battery or any other logic board issue. To know where the problem lies, a technician must conduct a full hardware diagnostics. Only then can Samsung advise you whether or not the phone can be repaired or if it needs replacement.

 


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.