I have an amp that shuts down almost everywhere I take it. I think this is related to undervoltage. It works OK on one circuit in my bandroom but on another circuit it shuts down every few minutes. I have had it cut out at gigs, and last week it cut out during an audition. I understand protection mode is supposed to be a Good Thing (tm) and folks will say this is normal behavior, but I have a backup amp that has never done this. In fact, every time my main amp cuts out, I whip my backup out of my gig bag and it runs fine all night. Both are good quality name brands. Is there any way to set the sensitivity of the undervoltage protection circuit?