Motorola Droid X :: Phone Auto-rebooting?

I'm starting to see a lot of automatic reboots of my phone, usually preceded by the phone hanging.This can happen when I go. to use an application and it might just freeze and reboot (not the result of an update).It also happens when the phone screen is off, phone is in "sleep" mode. I'll hit the home button to do something and have no response ... screen stays dark. I might hit the home button 1-2x more, but not holding it down or anything like that. After a couple of minutes, the phone will be rebooting itself. These are all full reboots ... I see the Droid eye, etc.