The other day at a dance I was playing, my ADA MB-1 unit just stopped working. It was working one minute and then stopped the next. Later I found out the problem was that somehow the program I was using deleted itself somehow. I have no idea what happened but at the time did not try to switch programs. If anyone has any idea what could have happened I would like to know. It really sent off a bad series of technical difficulties that really hurt the performance, so if anyone knows how to avoid this happening please tell me.