Savox servos tend to drawn huge power, ran into this myself. Whats happening is the servo is browning out the reciever. I picked up and installed a Novak glitched buster to run with mine, haven't had an issue since then. Here's a link to what you need: http://www3.towerhobbies.com/cgi-bin...&I=LXNRE0&P=ML