What to do if your new Samsung Galaxy Note 9 keeps rebooting on its own randomly?

System or firmware issues may occur every now and then regardless whether your phone is new or not, entry-level or high-end. So even if you have the new Samsung Galaxy Note 9, you may still be able to encounter this problem sooner or later. But the thing is that firmware issues can be fixed by doing some troubleshooting procedures provided that it hasn’t been modified in anyway and that your device still runs on a stock system.

In this post, I will walk you through in troubleshooting your Galaxy Note 9 that started to restart by itself randomly. We will consider every possibility and rule them out one by one until the problem is fixed. If you’re one of the owners of this new device and are currently bugged by a similar problem, continue reading as this article may be able to help you one way or another.

Before we move on to our troubleshooting, if you are looking for a solution to a different issue, make sure you drop by our troubleshooting page as we’ve already addressed some of the most common problems reported by our readers. Find issues that are similar with yours and use the solutions we suggested. If you still need our help after that, then feel free to contact us by filling up our Android issues questionnaire.

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How to troubleshoot Galaxy Note 9 that reboots on its own randomly?

Observation is key to fixing this problem and with that being said, it may take a day or two before you can say that the problem is fixed. Now, after doing the following procedures and the problem still occurs, you can always bring your phone back to the store so that a technician can check it out for you. You can also do that if you think it would be a waste of time to troubleshoot your device. However, for those who are willing to take a minute or two to figure out what the issue with your phone is, here’s what you need to do…

Run your Note 9 in safe mode

This is to determine if this problem is caused by one or some of the apps you downloaded and installed. By running your phone in safe mode, you’re temporarily disabling all third-party applications and services associated with them. This doesn’t fix the issue but will give you an idea to know if one of those apps is causing the problem. So, if your Note 9 doesn’t reboot by itself while in this mode, it means there’s really a third-party app that’s causing the problem and it will be a lot easier to fix it if that’s the case.

Here’s how to reboot the Note 9 into 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.

Assuming that the problem doesn’t occur while the Note 9 is in this mode, reboot it back to normal mode and continue using it until it reboots again but be mindful of the apps you use to know which one is the culprit. Upon knowing the app, you may try clearing its cache and data first but if that doesn’t work, then you really have to uninstall it from your device. 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.
  4. Tap UNINSTALL > OK.

However, if your phone also reboots by itself even in safe mode, the problem could be with the firmware. And for that, move on to the next troubleshooting procedures.

Reset All Settings

Incorrect configurations or settings may also cause the phone to have firmware-related problems and the thing is that it would be difficult to determine what settings you’ve changed and what are the defaults. To address this, there’s a very simple procedure that will bring the phone’s settings back to factory defaults. Don’t worry, the procedure is safe for your data and files as none will be deleted.

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

Continue observing your phone after doing this to know if the problem is fixed. If it continues to bug you, then try the next procedures.

Delete the system cache

There are instances wherein the system cache gets corrupted or obsolete and when this happens, performance issues may occur which includes random reboots and app crashes. We would only know that it’s really the case if your phone no longer restarts on its own after doing the following procedure. Don’t worry, your files and data will still be safe…

  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 three keys.
  4. An ‘Installing system update’ message will show for 30 – 60 seconds before the Android system recovery menu options appear.
  5. Press the Volume down key several times to highlight wipe cache partition.
  6. Press Power key to select.
  7. Press the Volume down key to highlight yes, them and press the Power key to select.
  8. When the wipe cache partition is complete, Reboot system now is highlighted.
  9. Press the Power key to restart the device.

Continue using your phone after doing this procedure to know if the problem is fixed or not. If it still occurs, then you have to do the next procedure.

Backup important files and reset your phone

Again, as long as the firmware in your phone hasn’t been modified in any way, a reset will be able to make your device run perfectly again. However, before doing so, make sure to back up your important files and data as they will be deleted during the process and you may not be able to retrieve them. Once the backup is completed, follow these steps to reset your phone…

  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.

If you still have issues after the reset, then bring the phone back to the store so that a tech can check it up for you. It’s possible at this point that the problem is already with the hardware.


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