I've been having this too, I was running Mysterious Beast theme for Liberty. Today in the afternoon was the last time it happened, did a battery pull, and now jus returned to stock liberty theme and so far so good.
Ill do a nandroid back up soon, there's something about straight up switching between themes that kind of worries me lol
Liberated Droid II
Know what ya mean nothing ya can't fix but whole lot work