I just upgraded to a 4S and restored my iphone 4 backup to it. Everything appears to be good, no battery drain, life is good. But I noticed this problem this morning. The ipod controls on the lock screen don't work, when playing something the play button should change to a pause but that doesn't happen so you can't pause. If it happens to be stopped you can play it though. Weird? In this screenshot it is playing something, can see that in the titlebar. I just don't have a pause button.