I'm also having the same problem, dropping back to home screen. However it didn't start till on the way home from a recent trip w/ approx. a (4.5 hr.) drive (7-27-10), it worked fine on the way there. Spoke the rep. I deal with @ local Verizon store I go to, while on the road & he suggested doing a roaming reprogram (*228 / option # 2). It seemed to work for approx. (50 mi.), then started again. I then called the (800 #) & spoke to a Verizon Tech, & they seem to not be aware of this issue. He said it sounds like a software issue & to try a complete phone reset, of which I didn't get a chance to.
Fast forward to today (7-29-10), when I started to write this I decided to call the Verizon tech dept. (1) more time to make sure I understood what the tech meant. I figured I would save this, do the reset, go out & try it, then come back & finish this reporting back if it worked. However as of about (2 hr. ago, eastern time) when I spoke to the tech, she was able to find info on this, & according her, Verizon & Motorla appear to now be aware of the problem, but there is no info on an update to fix it yet. She also suggeted not resetting the phone, as it appears to be a problem w/ the app not phone.
Also addressing the issue w/ the battery indicating it's charging, but in actuality it's discharging while phone is in the car cradle, go get youn battery replaced if you haven't already. I went to the Verizon store when I got back from my trip, told them what was happening & they replaced the battery. I then completely charged the battery w/ phone off before using it. I then went to an appointment w/ a (40 min.) drive, using the nav & making calls w/ bluetooth also on & it held the charge to (100%). I was @ my appt. for approx. (3.5 hrs.) w/ phone not charging & coming back home the charging icon showed on the battery icon & by time I got home it showed full charge. Both by icon & in About Phone>Status. Also the back of phone was nowhere near as hot as it had gotten before.
Hopefully this info, though it isn't much, will help w/ everyone's frustration a little bit.