Since the first day I owned my 4S I seem to keep locking up the phone some how... On the first day I double clicked the home button and pressed the camera app... it opened but then locked up with the shutter closed. I did this one or two more times since... I think it' only happens to me when on the lock screen. Today I double clicked the home button and hit "Play" to play whatever music I had queued up while at the gym and it froze again. I couldn't do anything except hold down the home and the power button to shut down the iPhone. Has anyone else had this issue? It doesn't happen every time so I can't "repeat" it for a genius at the genius bar. It just seems to happen randomly.