I wish I could help. We know that some users had to give up some Ketron products because there were too many glitches. Although problems happen to any keyboard. I guess if this problem happens rarely it is still a perfectly usable studio instrument but for a show, obviously, you want to be sure that it’s not going to happen again. Perhaps for now a reasonable option would be to carry some old keyboard that you can trust as a backup; not that you were asking about it, I just don’t want my message to be impolitely short.