[imrf]

I had a very similar problem the other day, and the iPod was the cause. The iPod locked up after changing tracks from the radio, and then the radio acted wonky for a while then finally locked up and rebooted. I unplugged the iPod and had to do a reset on the iPod to get it unlocked. Everything is working fine now. I'd say just random glitches. Maybe some of these can be fixed with a software update, but that's up to GM to get the discs to the dealers or send them out to customers. And I doubt either will happen.