If the Razer Phone restarts itself without any prompt, this issue is likely caused by incompatible apps or bugs in previous versions of the software that have since been fixed through updates. To fix this, do the following:
Note: Ensure the phone is sufficiently charged. You may also keep the device plugged in throughout the whole troubleshooting process.
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Boot the Razer Phone to safe mode.
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Observe the device for up to 24 hours to see if the issue persists. If the phone works normally under safe mode, the issue is due to a third-party application. Consider uninstalling the app that you last downloaded before the issue appeared.
To boot to safe mode, do the following:
For Android Version 9 (Pie)
After the reboot, the words “Safe mode” will be labeled on the bottom of the screen.
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Press and hold the power button.
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Touch and hold “Power off”on your screen.

- Tap “OK” when asked if you want to reboot to safe mode.

- If you are still experiencing the issue, check if you are running the latest software for the device. Ensure that your device is always up-to-date by performing a software update.
Note: Steps may vary depending on your device’s operating system.
For Android Version 9 (Pie)
- Go to Settings > System.

- Go to Advanced > System update.

- Tap “Check for update”.

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Tap “Update Now” if an update is available.
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If the issue persists, consider doing a factory data reset. To do that, follow the steps below:
- Before resetting your phone, first backup your data to Google Drive. Go to Settings > System.

- Go to Advanced > Backup.

- Toggle “Backup up to Google Drive” option on.

- To reset your phone, go back to Settings > System, then tap “Reset options”.

- Tap on “Erase all data (factory reset)”.

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On the next window, tap “RESET PHONE”.

- Before resetting your phone, first backup your data to Google Drive. Go to Settings > System.