iPod Touch 3G not Auto-Locking
My iPod Touch 3G is not auto locking, usually i just select a song and leave it auto-lock but when i came back, the battery was completely drained because the screen never turned off. It will dim in 30 sec but just stays dimmed. It has a passcode lock and auto lock set on 1 min. Is there a way to fix this, I have tried to reboot, restart, all of the usual stuff.
iPod touch, iOS 5.1.1, 3G 32 GB