Soo I have like 5 vmu that all say they can't save because vmu is defective. I played multiple games like DOA 2, Tokyo Extreme Racer 2 and Rayman 2 and the save fails but on Sonic adventure it saved perfectly fine. Do they not like sequels? What gives? I put fresh batteries in one and it worked for a day and then back to the same old. Help me !! Please and thanks in advance