I just played an outdoor festival today. We had to run all our instruments, plus one mic, and their PA off one line of electricity. I've had to do this before without issues, luckily. Today the keyboard player and one of the guitarists had an issue right from the start with their equipment losing power. I had an issue some time later where my Genz Benz Shuttle 6.0 lost power for a second, then would be fine. This happened fairly often. I assume this was caused by the voltage drop. The other guitarist has a nice power strip that tells the voltage. It was around 100 and sometimes in the high 90s. I changed my cable and that made no difference. Could you please explain how this works? I assume this would not damage the amp? I've had no problems with the GB before today. Thanks. It's an Allman Bros. tribute band.