I too have recently bought the SDJ-1 and it jumps randomly while gigging to any mp3 track on the card (not just the folder). This has happened every time I gig and I have to turn it off and on again only for it to happen later in the night!!!!!. I can see from this forum that other dj's SDJ-1's work fine. this MUST means we bought faulty SDJ-1's that left the factory without being tested fully, because every machine can't be checked as they roll off the production line and the odd one is missed, and we are the unfortunate ones that ended up with them!!. This is NOT GOOD ENOUGH.