[What's_nitro?]

I really don't think it's a mechanical problem. Nothing like that would cause such a dramatic increase in power consumption and leave the truck operable. I think it's the controller. Probably a defect in the feedback circuitry causing the timing to be extremely high, which would make the motor draw excessive current and heat up very quickly.

Now imagine the motor drawing that excessive current for the whole time you drove it, probably a few hundred-thousand revolutions, and therefore over a million pulses of extremely high current into the motor. It's an avalanche effect, because as the rotor loses magnetic strength it will draw even more current. You said it cogged a lot when it first started up, and the wires were really hot afterwards. That seems to support my theory.

It's kinda ironic, the FETs in the MMM didn't blow under the load. Maybe you can ask them just to replace the brain board in your controller since the FET board is fine...