So I had problems with our Hotshot and replaced the stock motor with TAMIYA Super Stock Motor Type-Rz. It has been amazing. So fast and way better than we expected. However, from time to time it just stops. Sometimes after just a minute. The steering still operates, but no forward and back motion. We then switch the car on and off and it works again for a while and stops. The engine is not hot, so unsure what's going on. New to the sport, so sorry if this is a silly question, but what to do?