Not sure what's causing this but, I'll be doing something on my phone - most recently typing a text message with on-screen keyboard and looking at apps in the market and my phone freezes up. Each time it has happened I thought it might just be a lag of some type but, inevitably while I'm waiting for it to un-freeze, the phone will just reboot. The only things I've done differently, since yesterday, when the problem started was to install Chevy's newest SS 4.7 and install Subsonic (media player). I didn't see anything in the ChevyNo1 section that really sounded like the issue and I didn't find much Googling subsonic+droid+reboot so, I figured I might try checking with the Rescue Squad. Thanks in advance for any help/advice!