i'm not to sure what you mean by it acts like its going into reverse. since there is no reverse i'm not sure how you mean. but the donut part i might be able to help. does it lock up on you when you turn and it wont resond to any commands from the radio? If so, check to make sure you have fresh batteries in both the reciver and transmitter. if your radio is like mine you have a battery scale the goes from green to red, but this only teels you the strngth of the bateeries in the transmitter. also check to make sure the crystal inside the reciever and transmitter are not loose.
this happened to me but the car would also go to full throttle with no input from me. so what i did was change the batteries and the frequency.