When I turn the Senton on, the wheels make a short spin. A few seconds later they spin fast and then stop. When using the controller, there is steering, forward, but no reverse. You put it in reverse on the throttle but it still goes forward. I used the binder that came with and followed a video and the instructions to "re-bind" the controller to the ESC, but it has not fixed it. I was careful to drive but did land flat hard a couple of times on the course and that might have shaken something loose. What is it the ESC, or something else?