If you are going over the defenses in a high speed gear, you may not have enough torque to the wheels / belts to actually climb. You can stall the motors, potentially causing the thermal breakers to break, and possibly causing the system voltage to drop below the reset point.
Use the recording capabilities and look at total current draw and voltage drop as you drive over defenses and around the field.
You can also use JVNs drive design tools to look at your drive design and the estimated loads.
My response is all based on a hypothetical situation, not one we actually experienced this season ...
