What to do if your Samsung Galaxy S8 keeps rebooting on its own after the rooting process [Troubleshooting Guide]

For the past few months after the unveiling of Samsung Galaxy S8, many of our readers were complaining that their supposed to be a high-end phone is already experiencing random reboots even if it is just sitting idle. Some said that after they installed some apps, their device will immediately restart without apparent reason. This issue is very frustrating to the owners because you’re unable to do anything at all on your phone and even if you can, there’s always this fear that it may shutdown any time and you will lose what you’re working on.

In this post, I’ll walk you through in troubleshooting your device to determine what the factors that might have caused this problem are.  We have to look at all possibilities and rule each one of them to pinpoint what really the issue is and if we can do something about the problem. So, if you are having this type of issue on your phone, just continue reading the post for you may find it helpful.

But before anything else though, if you have other issues with your phone, you can visit  our S8 troubleshooting page and choose an article that is related to your problem and follow the procedures that we provided. But if the issue still happening after you do so, you can contact us by filling up this Android issues questionnaire.

Troubleshooting Galaxy S8 that keeps rebooting

Problem: Dear/Sir I have a problem about my S8 device. I just rooted my phone and downloaded apps which need root. When I try to open the apps like xmod and luckypacher, my phone is rebooting suddenly. I tried to root again a few times but its still has same problem. How can I solve this problem? Thank you!

Solution: As what you’ve mentioned that the issue started after you rooted the device, it seems like this is a serious software-related problem. The rooting may have messed up the firmware and triggered the issue in your phone. In this case, you may need to re-flash the stock ROM or firmware. But since it’s too early to jump to a conclusion the best thing that you should do now is to rule out every possibility to see if there’s a change on its performance. Here are the things that you should do…

Try running your device in Safe Mode

In this environment, we will try to rule out the possibility that a rogue app might be causing the issue. In safe mode, all third-party apps will be temporarily disabled. If your phone stops restarting randomly while in this mode, it is clear that there are  apps that cause this issue. Find out which app it is and uninstall it

Follow these steps to run your phone in 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.

Assuming the device doesn’t restart on its own in this environment, find the app that’s causing the problem and uninstall it. Here’s how you do that:

  1. From the Home screen, swipe up on an empty spot to open the Apps tray.
  2. Tap Settings > Apps.
  3. Tap the desired application in the default list or tap 3 dots icon > Show system apps to display pre-installed apps.
  4. Tap the desired application.
  5. Tap Uninstall.
  6. Tap Uninstall again to confirm.

However, if the phone still reboots when in safe mode or if the problem continues after uninstalling some of the apps you suspect, try doing the next step.

Wipe Cache Partition via Recovery mode

Rooting doesn’t change anything in your phone except for the permissions. If you did it right, then the problem might not be due to the fact that the phone is rooted now but it could be due to some files that may not be working properly now that some permissions may have changed. Among the files that will be affected are the caches created by the system. Therefore, you have to try to see how your phone behaves after you wiped off all contents of 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 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 the Power key to select.
  6. Press the Volume down key to highlight “yes” and press the Power key to select.
  7. When the wipe cache partition is complete, “Reboot system now” is highlighted.
  8. Press the Power key to restart the device.

Your phone may take a little time booting up as it will rebuild all the caches that were deleted so just wait for it to become active and then continue your observation. If the issue still occurs after this, then you have to do the next step.

Backup your files and reset your phone

Keep in mind, you can do a reset on your phone if all methods you performed failed to get rid the problem. In other words, you will bring the device back to its original form by deleting all your saved files and data like contacts, photos and music. So, before you proceed make sure you transfer all of it to your SD card or your computer so that you can easily restore it once the problem is fixed. After backing up your files don’t forget to disable the Factory Reset Protection (FRP) to avoid locking out your phone. Here’s how to do so:

  1. From the Home screen, swipe up on an empty spot to open the Apps tray.
  2. Tap Settings > Cloud and accounts.
  3. Tap Accounts.
  4. Tap Google.
  5. Tap on your Google ID email address if multiple accounts are setup. If you have multiple accounts setup, you will need to repeat these steps for each account.
  6. Tap 3 dot icon.
  7. Tap Remove account.
  8. Tap REMOVE ACCOUNT.

After disabling the FRP and you are ready to do the reset, follow these steps

  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.

But if resetting your device failed to fix the issue then, you don’t have a but to reinstall the stock firmware and please note that your warranty may have already been voided especially if the Knox counter is tripped. If you can’t fix the problem on your own, you may not be able to claim warranty if you bring the phone back to the store. I am sure you are technical enough to reflash the firmware as you’ve even tried rooting the phone. So, good luck with your troubleshooting.

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