Hi Montetkd
Welcome to BlackBerry Support Forums
Have you try a Battery pull restart , If not do it like this remove the Battery wait for a min. then re-insert it back, See if your device stops rebooting by itself. If problem continue then Try to Boot your device on Safe Mode , On safe mode Uninstall that particular application from Options > Device > Application Management > Delete that application . Once deleted Reboot your device by removing the battery while your device is Powered On .After rebbot see if problem resolves.
KB17877 : How to start a BlackBerry smartphone in Safe Mode
Try it and let us know.
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