[Chris Mounts]

For what it's worth we discovered a few weeks back that hitting some of the defenses, for example the rock wall, can cause a hard stall depending on angle of approach, tires, etc.

We had made a mistake in putting 8" numismatics on the stock KOP chassis with only slightly adjusted gear ratios. According to the JVN calculator Excel we would be at over 90 amps per motor.

The power draw was so high in this situation that we observed arcing across the primary breaker polls. This lead to many brown outs most typically the radio dropping.

What a lot of you are describing sounds very much like what we experienced. Make sure you've run the numbers on your drive train.