Did you use different batteries in your dads radio? And is this the first time it has done it? It could be radio interference, or if you used the same batteries in the transmitter, it could be bad batteries. If this is a common occurance, and you used different batteries in the transmitter then it could very well be the reciever. Can you try your dads receiver in your truck to make sure its not the servos? If you can rule out everything else first, then you can tell if its the receiver. Also, pull the cover on your receiver and make sure the antenna hasn't come unsoldered and that the inside of the case is clean. Let us know how it goes. If you do find out is the receiver, call Cen and they should replace it for you. If they wont, let me know and I will call them for you.