Thing is, what's the buzz over at Korgforums about this issue? I would have thought that's the place to find out if this is common, if there's a repeatable way to produce it (hard to get action from Korg until you can spell the problem out in a way they can get it for themselves), and whether anyone has figured out a workaround.

From having run the Roland-Arranger.com Bug Forums for some years, my experience is that the more information you can give them to reproduce the bug, the better your chances of them taking it seriously and fixing it. So, I know it's bit of a chore, but if you can write down quickly as much as you can remember from any lockup happening, the style used, the Performance, the Songbook entry, RH sounds, and then what you were trying to do, with any luck and a bit of perseverance, you can get it to happen again at home.

Once you have a repeatable bug, the manufacturers take you FAR more seriously, and a fix should be coming, with any luck, or at least a workaround.

The thing is, most of our modern arrangers have Songbooks, Performance Lists, MusicFinders, etc.. and fully using these can save you a ton of button pushing between (and during) songs. If that's the issue (too rapid button pushing), making full use of these features should cut back on the need to do that so much. Many of us came from the 'Free Panel' days, and still tend to do much that way, but more modern ways now exist, at the cost of more preparation at home.

If a fix doesn't appear quickly, perhaps using these more fully can help?