When driving the car at the track, throttle will go dead at about the same time/point during a lap. Throttle stops responding for a second, then comes back. New lap, rinse and repeat.

Issue has happened with 2 different receivers and 3 different ESC's. The only common denominator is the transmitter itself.

Is the radio shot? What are some troubleshooting steps I can take? Can the unit be reset?

Note: electric car.