I just posted a note asking about the err message as well. What you described is EXACTLY what mine started doing. It loads the discs...plays for a while, then stops playing and reads "err 21". Mine ejects the cart all right, but it won't play. Radio and tape is fine. This apparently seems to be a common problem, and surely someone, somewhere knows what the trouble is. Can anyone out there tell us whats up with this???
BlkLxus <_<