I have never had a problem, but I drive a Thomas Conventional.
Try contacting your dealer, or go to www.thomasbus.com and try contacting someone from there for help. I don't know who your dealer is mine is Hoekstra truck sales, they are very prompt when you have a problem. The dealers are usually faster, but if that doesn't work contact Thomas.
We had a few that did this,we tried a slightly larger circuit breaker and that solved the problem.We have also had alot of trouble with the bus bars themselves not making good connections and causing the breakers to trip.The breakers themselves also get week from time to time.