I hope someone can help..

When playing General MIDI files on my XP-80, the outputs(all of them)suddely get very disorted. Even if I stop the seq. and try to play a patch, it is still distorted. The only way to fix it is to turn off the power and turn it back on. It happened twice today within an hour.
Could it have something to do with Sysex messages that are sometimes in General MIDI files?
HELP ME PLEASE!