Reply to Ghost record

I've been playing with my s4 for a few days now and twice I've had a track playing when there are no faders up. It's hard to explain, imagine your just happily mixing 2 records then all of a sudden it sounds weird, like one of the records is doubled up. You pull down all the faders so nothing should be playing and one of the tracks is still playing except you don't know where it's playing from and you cant control it. I don't believe it's the record function because it's not on a loop. But both times it's happened I've had a few beers so it could be me doing something stupid. Any help fellas?