IPhone won't go to the next song!!

I have a iPhone 3gs and it's jailbroken with mms. (don't know if it matters). When I play a playlist or a shuffle or anything. After a song finishes it cuts off and the phone cuts to the home screen. 2 days ago I was listening to it fine. All I did between then and now was put Cage the elephant album on it and download some stuff from cydia. I tried deleteing what I downloaded from cydia and trying again but still does it..... What can it be thanks!!!