It's been over a month now that I posted about phone shutting off and then powering back on and now it does it at least daily.
My wifes Revolution did it on Sunday for the first time. Needed directions to a car dealer while on the road and when she was ready for the navigation to give directions it shut down so I had to pull over and wait for reboot, this is getting to be a real pain in the rear. We were using Google maps which works good and she has only a few added apps on her phone.