I posted this issue several weeks ago. Trying again. I have had an Ensoniq SQ2 for many years. It just recently has been shutting down on me. It just freezes up - no sound and can't change presets. Window is also stuck. I finally figured it was the unit gone bad (old) and since there was no one around that worked on them I found a replacement through Musician's Friend. Same model. Worked great at home when I got it. But at the first gig with it, again it started freezing up - usually in the middle of a song. As with the old one, I would have to turn it off - wait - and turn it back on to get it working again. Starting to think that maybe it has something to do with the placement. I always set my keyboard on top of my Hammond B3. Could there be something that would cause that? Maybe something from the tone generator? Am at a loss. Any thoughts would be much appreciated.