What to do if your Galaxy S8 turns off automatically [troubleshooting guide]

Welcome to another troubleshooting article for the day! This post will bring you some of the common issues for the #GalaxyS8 as well as their solutions. The main issue for this document will try to solve one of the perennial problems for smartphones — random restart or reboot. When it comes to Samsung devices, software troubleshooting is similar across devices so even if you have other Galaxy or Note models, the suggestions below should still apply.

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: What to do if your Galaxy S8 turns off automatically

Phone Model: Samsung Galaxy S8. Last few days my phone turns off automatically. After automatic turn off while I try to switch on it’s not working. Every time I have to connect charger to switch on mobile after automatic turn off. Without connecting charger I am not able to switch on mobile. While charging level showing more than 80% then also I face automatic turn off issue. Daily I am facing this issues 4-5 times. Kindly suggest me how to resolve this issue. Thanks in advance for any solution.

Solution: Looks like you have a bad battery issue. To see if it’s being caused by an operating system bug, there are three basic software troubleshooting steps that you can try:

Cache partition wipe
Calibration
Factory reset

How to clear S8 cache partition

Android devices uses several partitions in its storage device to operate. One such partition is called cache partition that keeps the system cache. This cache can sometimes get corrupted leading to all sorts of issues, including one that may affect power management. To see if this is what you’re experiencing, 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.
Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
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).
Press the Volume down key to highlight “wipe cache partition.”
Press the Power key to select.
Press the Volume down key to highlight “yes” and press the Power key to select.
When the wipe cache partition is complete, “Reboot system now” is highlighted.
Press the Power key to restart the device.

How to calibrate the OS and battery

Another reason for your problem may be due to a much needed calibration. Android may sometimes lose track of correct battery levels, especially if it’s been running continuously for a long time without a reboot. Aside from doing regular restarts (at least once every week), it should also be a good idea to calibrate it from time to time. This will allow the system to establish a benchmark in reading the battery. Follow the steps below to do this troubleshooting:

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.

How to factory reset your Galaxy S8

The last troubleshooting step to do in this case is factory reset. You only want to do this is if there’s no change in your phone’s battery or power behavior after doing the first two suggestions above. Factory reset will return all software information to their defaults. If the problem is being caused by a software or app bug, this should help to fix it.

Create a backup of your personal data.
Turn off the device.
Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
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).
Press the Volume down key several times to highlight ‘wipe data / factory reset’.
Press Power button to select.
Press the Volume down key until ‘Yes — delete all user data’ is highlighted.
Press Power button to select and start the master reset.
When the master reset is complete, ‘Reboot system now’ is highlighted.
Press the Power key to restart the device.
Let the phone run for 24 hours without adding any apps.

Repair

Should the problem stay after you’ve wiped the phone, the most likely reason for that is bad hardware. It can be due to malfunctioning battery, or any other failing component. Only a technician can figure that out for you so at this point, you want to send the phone in to Samsung.

Problem #2: Galaxy S8 charges very slow

Every time my phone dies completely 0% and i go to plug it in, it will turn back on it will still say it’s at 0% and then shut off and then do this process over and over. I have to let it stay dead for 24 hours for it to charge. I have tried a soft reset, tried different cables and boxes and when it does decide to charge, it take almost 4 hours to charge. please help, i don’t know what is wrong and if it’s fixable. i have dropped my phone a bunch of times and my back screen is broken.

Solution: Kindly visit our suggestions for Problem #1. Your case appears exactly similar to the one above so the things that you can do should be no different. You’ll probably end up having to let a professional take a look at the device so be sure to do that if you’ve already tried everything on your end. Hardware problems are 99.9% unfixable on an end user’s end. If your phone’s motherboard is defective or have become so after dropping the device, a major repair may be necessary.

Problem #3: Galaxy S8 screen stays black or blank

Hello!! I’m having a huge problem with my Samsung galaxy s8. I’ve dropped it a few times recently and the screen started to flicker white, from middle to bottom. I could only see the top of the screen and i tried to reset my phone and also clear cache but it seems it only made it way worse. Not only does my phone flicker white upon turning on, the whole screen turns light green then goes completely black but the screen is responsive, the tab and back button beside the home button light up when i tap it. So the screen is black but responsive, also if i tap the power button you can see the white flickers but goes back to black immediately.

Solution: This is a clear hardware issue. The screen must be damaged that’s why it’s no longer showing any images and just showing blank or black. There’s no software fix for a broken LCD so you need to send the phone in for repair. If you’re lucky and the damage is only isolated to the screen assembly, replacing this part may be a relatively easy fix.

While there are a lot of videos that can show you how to replace a Galaxy S8 screen, we highly recommend that you let a professional do it for you so other possible hardware issues can be given attention. Dropping an electronic device, in your case for several times, can sometimes result to other components and not just the screen from becoming disconnected or shorted. It’s possible that the problem in your device may be coming from other sources and not just the screen. Replacing the screen assembly won’t automatically fix other components so you may end up having other problems after a successful screen replacement procedure.