Could it be apps? i don't want it to be the phone... Was looking for an app on the market and restart... the 2nd one, i was changing the song in spotify..and restart... ? is this a sign of thunderbolt probs?
Lots of people are having random reboots. Combination of far from bugless software and apps that don't support ICS properly. Mix those together and you get some reboots. Some are getting more than others.