OK, had my first experience with the issue last night. The recorder stopped twice during the show with a "Disk Too Busy" error, and I heard at least one series of brief skips in a song a few minutes later. There was some vibration, but the Korg was tucked into a Sonicase and had foam on the sides to keep it in place. Bag was on the floor though (concrete). Maybe vibrations through the back of the machine? It wasn't THAT loud in there, although the bag was about 6-7 feet from the back of one of the guitar amps.
Jerry, what's the deal? I'm running 1.5.1 and I thought this was fixed?