"4stringbanjo"....... Your symptoms sound like you have dirty connections as mentioned above, or a bad ground elsewhere. About 90% of the time, a bad ground is the issue. Here are a couple of things to check. Go to your inverter and tightened the battery cables at the inverter. On the positive cable to the inverter, there is a large fuse, about the size of a standard bandage. Check that it isn't partially burned or the connections are lose.
Don & Mary
2014 Newmar Dutch Star - All Electric - 450 ISL
2016 GMC Canyon 4WD Crew Cab