Starting last night, my phone (the Motorola Droid) began shutting off by itself. It happened every 2-3 minutes and then after shutting off, it turned on again by itself. I tried restarting the phone but nothing worked. When I woke up this morning, it wasn't doing it anymore, but then at about 4:20 this afternoon it started turning off again. Any ideas? Is it caused by Verizon or Motorola?