I had an issue with my 2001RB at practice tonight. While playing, the amp kept turning off and turning back on. It didn't flash orange (protection mode). I changed cables, outlets, and narrowed down the possiblity of it being a problem with the head. I have used this same configuration without change for a year. I did have it serviced about 6 months ago because of a bad transformer. Could you help me figure out what is wrong and how to fix it?