How to fix Samsung Galaxy Note 9 that keeps rebooting by itself after an update

Random reboots may occur even to high-end devices like the Samsung Galaxy Note 9. More often than not, it’s just a minor issue with the firmware but there are times when it’s just a sign of a more serious hardware problem especially if your phone suffer either physical or liquid damage. As the owner, you should be the first one to know if the problem is caused by one or those factors.

In this post, I will walk you through in troubleshooting your Note 9 that started to reboot by itself either randomly or frequently. We will try to determine every possibility and eventually fix the problem. If it’s just a firmware issue, then you can fix it by yourself but if it’s a hardware problem, you may need to seek the help of a technician to make your phone work perfectly again.

Before we move on to our troubleshooting, if you have other issues with your device or if you’re looking for a solution to a different issue, then visit our Galaxy Note 9 Help Guides for we have already addressed some of the most common issues with this device. Odds are that we may already have published articles that could give you some hint or help you fix the problem with your phone so take time browsing through that page.

Now, going back to our troubleshooting, here are the things you need to do if your Galaxy Note 9 begins to reboot on its own…

  1. Run your Galaxy Note 9 in Safe Mode. It is possible that the reboots are caused by some third-party applications. That is the reason why you need to run your Note 9 in safe mode to temporarily disable all third-party elements. This way, you would know immediately if the problem is because of some third-party applications or not. If it’s because of those apps, then it would be easier to fix the problem; you just have to know which app is the culprit and uninstall it. That would usually fix the problem.
  2. Uninstall apps that may be causing it. Assuming that your phone doesn’t reboot by itself when used in Safe Mode, then one or some of the apps you installed must be causing the problem. Reboot your phone back in normal mode and then use it like you always do but this time though, be mindful of the apps you use to know which one triggers the problem. Depending on how serious the problem is, your phone may not restart by itself for several hours but the key to fixing it knowing the culprit. Upon knowing the app that’s causing the issue, you may try resetting it by clearing its cache and data and if that doesn’t fix it, you have to uninstall it.
  3. Delete system cache. You would only need to do this if your Note 9 still reboots by itself even when used in safe mode. It’s possible in that case that the problem is with the firmware but the best thing to do is to go after the system cache first before anything else. For this, you just have to reboot your phone into the Recovery Mode and then wipe the cache partition from there. What it does is delete the old system cache and replace it with a new one. Had this problem been happening due to a corrupted system cache, doing this procedure should bring it back to normal.
  4. Reset all settings. Another possibility you will have to rule out is the chance that some settings have something to do with the random reboots of your device. By resetting all settings, you’re bringing the device back to its default configuration. Basically, this procedure has the effect of a full reset but none of your files and data will be deleted so it’s safe for your files and it’s also very effective. Please refer to the instructions below on how to do this procedure.
  5. Perform factory reset. A Master Reset is necessary if your Note 9 is still rebooting by itself even after doing the previous procedures. This will finally rule out the possibility that the problem is only with the firmware. It’s also a preparation so that if the problem isn’t fixed by it, you are ready to bring it back to the store or shop without worrying about your files and other personal information as all of them will be removed from your phone’s internal storage. However, make sure that you create a backup of your important files and data prior to doing this procedure as all of them will be deleted and you may not be able to retrieve them after that.

Refer to these instructions on how to do the procedures I suggested above…

How to reboot Note 9 in Safe Mode

  1. Turn the device off.
  2. Press and hold the Power key past the model name screen appearing on the 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. When Safe mode appears in the bottom left corner of the screen, release the Volume down key.

How to Uninstall an app from the Note 9

  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.
  4. To display preinstalled apps, tap Menu > Show system apps.
  5. Tap UNINSTALL > OK.

How to Reset All Settings of Note 9

  1. From the Home screen, swipe up on an empty spot to open the Apps tray.
  2. Tap Settings > General Management > Reset > Reset settings.
  3. Tap RESET SETTINGS.
  4. If you have set up a PIN, enter it.
  5. Tap RESET SETTINGS.
  6. The device will restart to perform the reset of settings.

How to Master Reset Note 9

  1. Back up data on the internal memory. If you have signed into a Samsung account on the device, you have activated Anti-theft and will need your Samsung credentials to finish the master reset.
  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.

I hope that this how-to post has helped you one way or another. Please help us spread the word by sharing this post to your friends or people who may also have similar problems. Thanks for reading!

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