Check that the antenna isn't rubbing against the chassis as mine got rubbed thru and I think shorted the sensor. After trying playing with the left switch on the remote about 20-30 times it synced again with my chopper and I touched the open antenna wire purposely against the chasis and it would lose signal, then I removed it and it worked again. Tried that a few times so I think it's rubbing against something causing it to short out.