Blackberry 9720 Keeps Rebooting

My 9720 keeps rebooting – receiving a msg, when I click to open it, when on a call, it just reboots.

I have done the following:

 

The 4hr process of leaving on charge, removing battery, replacing battery, leaving on charge again…

I backed up and did a Security Wipe, reloaded back up.

 

What more can I do?  This is frustrating!!!!

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