many things can go wrong but its rare today. had 3 futabas fail on me .one with rf output (crash)intermitent. two suffered failure of channel to elevator servo in the DOWN position only. still gave up.verified by swapping moduals on identical tx's. servo was not the problem. loose anttena can still cause crash. also seen a RX anttena loose from the circuit board or hanging by a thread. i have also seen RX's work perfectly untill the engine was started then quit.hairline fracture of board.