Every 8th Key on my S88 MK3 is dead. Probably a scan row or column issue. What is a bit concerning is that the keyboard is VERY lightly used. Maybe like 15 hours of playing time total. The keyboard has actually been off for about 5 months. I finally got back to it and did the latest firmware update (successful) and notice that some keys were not responding. Tried multiple resets AND working my way back up through firmware revisions. No luck. Any ideas