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What to do about your Samsung Galaxy S8 Plus that keeps restarting / rebooting [Troubleshooting Guide]

When a phone doesn’t power on, it’s more likely a hardware problem but when it won’t bootup successfully, then we might be looking at a possible firmware problem especially if it keeps on rebooting on its own. We have received quite a lot of complaints from our readers who own the Samsung Galaxy S8+ suggesting there are units that are frequently or randomly restarting. We may have already addressed this kind of problem before but we have to tackle it again for the benefit of our readers who contacted us.

I will walk you through in troubleshoot your Galaxy S8+ that keeps on rebooting on its own for some reason. We will look into every possibility and try to rule them out one by one so that we can try to find out what the problem really is, what causes it and what needs to be done to fix it. There’s no guarantee that we can fix this problem but we will give it a shot to try and save you from making a trip to the shop. So, if you have this phone and this problem, continue reading this post for it might help you fix the problem.

Now, before we go to troubleshooting, if you are currently experiencing a different problem, try to visit our troubleshooting page for we have already addressed some of the most common issues owners encountered with their device. Find issues that are similar to yours and feel free to use our solutions or troubleshooting guides. If they don’t work, however, and if you need further assistance, contact us by completing our Android issues questionnaire. All we need is information so we can help you. Don’t worry, it’s free.

How to troubleshoot your Galaxy S8+ that keeps rebooting

Problem: I have the S8+ phone I bought three months ago and for some reason it doesn’t work normally now as it keeps on restarting on its own and I don’t know why it’s doing this. Even if it reboots though, it’s still doing fine and I haven’t noticed any change in its performance. I really don’t know what happened to it but I just want my phone to work normally again without the reboots. Can you guys help me out? Thanks.

Troubleshooting: This problem may range from a simple firmware issue to a very complex one depending on the situation and how it started. Again, we have to consider every possibility and we will be basing our troubleshooting from them. That said, here’s what I suggest you do about this issue:

Step 1: Find out if the phone still reboots on its own while in safe mode

It is important to know if the reboots continue even if your phone is in safe mode because it will give us a clearer perspective on what the problem really is and what caused it. While in this environment, all third-party apps are temporarily disabled. If the reboots continue, then we might be looking at a firmware problem, otherwise, it must be one or some of the apps you installed that’s causing or triggering the problem.

Here’s how you boot your Galaxy S8+ 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 your phone works perfectly while in this mode, then you have to find out which of the apps you installed is causing the problem. Of course, it’s difficult to determine the culprit so try updating the apps that need to be updated. Here’s how…

  1. From the Home screen, swipe up on an empty spot to open the Apps tray.
  2. Tap Play Store.
  3. Tap the Menu key and then tap My Apps. To keep your apps automatically updated, tap the Menu > Settings then tap Auto-update apps to select the check box.
  4. Choose one of the following options:
    • Tap Update [xx] to update all applications with updates available.
    • Tap an individual application and then tap Update to update a single application.

However, if  you’re already suspecting an app or two, then you can proceed to clearing their caches and data or even uninstalling them just to try to find out if they’re really the cause of the problem.

How to clear apps caches and data on Galaxy S8+

  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 Storage.
  5. Tap Clear cache.
  6. Tap Clear data and then tap OK.

How to uninstall applications from your Galaxy S8+

  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.

On the other hand, if the problem still occurs in safe mode, then you have to do the following steps.

Step 2: Reboot your phone in Recovery Mode and wipe cache partition

The purpose of this step is to rule out the possibility that this problem is caused by some corrupt system caches. These files are being used by the system to make your phone run smoothly. But when they become corrupt, performance-related issues may occur like random reboots and shutdowns. In this step, I will walk  you through in deleting all system caches so that they will be replaced with new ones and here’s how you do it:

  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 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 while booting up after this procedure as it will rebuild those caches. But once it becomes active, observe it closely to know if the problem still occurs and if so, then you have no other choice but to do the next step.

Step 3: Backup all your files and data and then do the Master Reset

If you phone still randomly reboots after wiping the cache partition, then you should try doing the reset to bring the phone back to its default settings or configuration that works. However, make sure you make a backup of your important files and data as they will be deleted. Also, don’t forget to disable the factory reset protection or anti-theft feature so that you won’t be locked out of your device.

How to disable Factory Reset Protection on Galaxy S8+

  1. From the Home screen, swipe up on an empty spot to open the Apps tray.
  2. Tap Settings.
  3. Tap Cloud and accounts.
  4. Tap Accounts.
  5. Tap Google.
  6. 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.
  7. Tap 3 dot icon.
  8. Tap Remove account.
  9. Tap REMOVE ACCOUNT.

How to bring your Galaxy S8+ back to its factory settings

  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.

Alternatively, you can also reset your phone from the Settings menu…

  1. From the Home screen, swipe up on an empty spot to open the Apps tray.
  2. Tap Settings > Cloud and accounts.
  3. Tap Backup and restore.
  4. If desired, tap Back up my data to move the slider to ON or OFF.
  5. If desired, tap Restore to move the slider to ON or OFF.
  6. Tap the back button to the Settings menu and tap General Management > Reset > Factory data reset.
  7. Tap Reset device.
  8. If you have screen lock turned on, enter your credentials.
  9. Tap Continue.
  10. Tap Delete all.

I hope this troubleshooting guide helps.

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