I suggest trying a new/different battery. If that doesn't fix it then it may be software related.
Important: Make a full backup of the device using BlackBerry Desktop Software before continuing.
Go to Options >Security Wipe. Wipe the device, including 3rd party applications. Does the device still exhibit the same behavior?
If yes, then you can try reloading the OS to the device. If we need to do that I'll provide instructions.
If no, then restore your backup file to the device and see if the device still works normally. If it does then you can begin to reinstall your apps one by one until you find the one that is causing the reboot problems. If the problem comes back then you know it was something in your personal data and you can wipe the phone again and restore only the most important data from the backup and start over fresh for everything else.
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