This did happen to me during a few gigs last summer, (Genos freezing even without any error message) but strangely and luckily it has not happened for months now. My only explanation is that all the the files that might have triggered this break down have been "cleaned up" by the tweaking of both style files and midi files, which was not done methodically but whenever I realized they could be tweaked to sound better. The material was all taken from my TYROS 5/6 and there never was a problem with the material on the T, but as Eileen has explained so many times, the Genos is an other animal. What causes indigetion for G does not necessarily disturb T.
Cheers
Kaarlo