When a high-end smartphone like your Samsung Galaxy S9 keeps rebooting by itself for no apparent reason, you can always expect it to be an issue with the firmware. But no matter how frequent those reboots as long as the firmware of your device hasn’t been modified in any way, you should still be able to get rid of those restarts and make your phone work perfectly again.
In this post, I will walk you through in troubleshooting your phone that keeps rebooting on its own. We will consider every possibility and rule them out one by one until we can determine what the issue is and hopefully fix it. So, if you’re one of the owners of this phone and are currently having to deal with the same issue, continue reading as this article may be able to help you one way or another.
Before we move on to our troubleshooting, if you happen to find this post while looking for a solution to a different problem, then visit our Galaxy S9 Help Guides page for we have already addressed some of the most common issues with this device. We may have already published articles that could help you fix your problem. Find issues that are similar to yours and feel free to use our solutions.
Troubleshooting Galaxy S9 that keeps rebooting on its own
In troubleshooting possible firmware issues, you need to be thorough to determine what the culprit is and so that you won’t lose any of your important files or data. We will start from the very simple problem and proceed to more complicated procedures of the issue persists. Here’s what you need to do:
First solution: Run your phone in safe mode
We need to know immediately if your third-party applications have a hand in this problem. That’s the reason why you run your phone in safe mode, to temporarily disable all third-party apps. If the phone still restarts on its own even in safe mode, then troubleshoot the firmware. But if the phone no longer restarts in safe mode, then it means there is an app or a group of apps that’s causing this issue. Follow these steps to restart your phone in safe mode:
- Press and hold the Power key until options show.
- Tap and hold the Power off option until it changes into Safe Mode.
- Tap the Safe mode icon to restart your device.
- Once the reboot is successful, you should see ‘Safe mode’ at the lower-left corner of the screen.
Assuming that your phone doesn’t restart in safe mode, then do this;
- Restart your phone normal to boot into standard mode.
- Remember the apps you installed about the time when the phone starts to reboot by itself.
- Once you already have an app in mind, swipe down from the top of the screen to pull the notification panel down.
- Tap the Settings icon on the upper-right corner.
- Scroll to and then tap Apps.
- Find and tap suspected app.
- Tap Storage.
- Touch Clear data and tap OK to confirm.
- Tap the back key once and then touch Uninstall.
- Confirm that you want to remove the app from your phone.
On the other hand, if your phone still keeps rebooting in safe mode, then move on to the next solution.
ALSO READ: What to do with your Samsung Galaxy S9 with Black Screen of Death?
Second solution: Reset all settings
This is also a very important procedure to try and fix your phone that keeps rebooting because the problem could have been caused by some incorrect settings. Don’t worry, none of your files will be deleted if you did this.
- Swipe down from the top of the screen to pull the notification panel down.
- Tap the Settings icon on the upper-right corner.
- Scroll to and tap General management.
- Touch Reset.
- Tap Reset settings.
- Tap the Reset settings button.
- If prompted, enter your PIN, Password or Pattern.
- Finally, tap Reset.
Once the phone has finished the reset and it’s still keeps rebooting by itself, then move on to the next procedure.
Third solution: Wipe cache partition to fix phone that keeps rebooting
Sometimes the system cache gets corrupted and when it happens, performance problems may occur and it can be one of those cases. To rule this possibility out, wipe the cache partition to delete the system cache and replace it with a new one. Here’s you do that:
- Turn off the device.
- Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
- When the Galaxy S9 logo shows, release all three keys.
- Your Galaxy S9 will continue to boot up into the Recovery Mode. Once you see a black screen with blue and yellow texts, proceed to the next step.
- Press the Volume down key several times to highlight wipe cache partition.
- Press Power key to select.
- Press the Volume down key to highlight yes, them 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.
Once the phone has rebooted, continue using it to know if it still keeps rebooting by itself. If it still does, then try the next solution.
ALSO READ: How to fix Samsung Galaxy S9 with WiFi that keeps disconnecting
Fourth solution: Master reset your phone
At this point, a master reset is necessary. If the firmware wasn’t modified, then a reset will fix this problem. However, make sure to create a copy of your files that you don’t want to lose. After the backup, follow these steps to remove your google account:
- From the Home screen, swipe up or down from the center of the display to access the apps screen.
- Open Settings app.
- Tap Accounts and backup.
- Tap Accounts.
- Select the appropriate Gmail address. If there are multiple accounts, make sure to pick the one you want to remove from the device.
- Tap Remove account.
- To confirm, review the notification then tap Remove account.
- Restart your phone to refresh the memory.
And then, follow these steps to do the Master Reset:
- Turn off the device.
- Press and hold the Volume Up key and the Bixby key, then press and hold the Power key.
- When the Galaxy S9 logo shows, release all three keys.
- Your Galaxy S9 will continue to boot up into the Recovery Mode. Once you see a black screen with blue and yellow texts, proceed to the next step.
- 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’ 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.
I hope that we’ve been able to help you fix your Galaxy S9 that keeps rebooting by itself. We would appreciate it if you helped us spread the word so please share this post if you found it helpful. Thank you so much for reading!
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