[whytheheckme]

Well, from the information given, we know that the 120 Amp breaker didn't trip (he said that the bot was still on when they went to retrieve it.)

As far as the "slow-blow" self resetting breakers, once those trip, they will try to reset themselves after a second or two. The likelyhood that both of these tripped at once, and continued to trip over and over again is unlikely.

I'm sticking with a control problem. Even if it wasn't radio, maybe your program found somewhere it shouldn't be and got caught in a loop somewhere. This would be consistent with the robot working fine after a reset, because the program would start over and not be stuck in the loop (who know the conditions that could have caused the processor to get lost.)

Jacob