rebind the radio to the receiver as per the instruction manual, keep the servos straight if possible, neutral position or if all fails unplug the servos from the receiver when binding, sounds to me that the fail safe is acting up and over taxing the servos when it loses signal
when your done binding the radio and have the receiver turned on, shut off the radio to see what exactly the servos will do when the signal is lost, hope it helps
make sure the car is not running either electric or nitro when doing this