Sounds like a freq. conflict. First off have you put fresh batteries in your car and TX? Second have you tried going to a wide open area away from the public? Away from power lines, away from electrical sources of buildings and things like that? If so then I'd suggest checking your wiring. I've seen this happen. If the colored insulation of the servo wires contact anything metal they will glitch and go crazy. Pull your electronics out and look over all the wiring. Try to find bare wires showing.