Haven't seen this reported yet...
I've just noticed that the Now Playing display on the lock screen has stopped counting seconds at random times. When this happens, unlocking the phone and opening the music.app while the song is still playing causes the music to skip back to the second mark that the lock screen had stopped counting at.
Quick frame of reference, in the attached screenshot, the lock screen is showing the song stuck at the 51 mark, however you can see the pause button clearly indicating the song is still playing. When I unlock the phone and tap the music.app, the song playing will immediately jump back to the .51 second mark in this instance...no matter how far along I am on the song playing.
Has anyone encountered this or able to replicate it? Only seems to happen when unlocking the phone and tapping music.app - if the app was already open, no skipping occurs.
iPhone 4 btw & music via BT, if you couldn't tell