sounds like what my wife's ESC control did in her RTR sc10. it quit working then started to go then stalled out and barely spun the wheels. then the motor leads to the ESC got very hot. hooked the motor to a different ESC motor worked fine. hooked the ESC to a different motor and the ESC did the same thing to that motor it barely spun the rear wheels and the leads from that motor got very hot. i say bad ESC. we had a couple at our local track that was bad. i say send it in for warranty repair/replacement.