I've had 4 servos go bad while using this receiver, (2) JR9100 Digital Servos and (2) Hitec 7940Th Digital HV Servos. All were on the throttle side (channel 2). Each would work fine for a few weeks months until the problems started. The JR servos both reacted in the same manner by locking in a throttle open position as if the failsafe was cutting on but in the wrong direction! I checked the failsafe and even turned it off but nothing would fix it. I replaced the servo with another JR and it worked fine for a month or so and then failed/in the same manner. I then replaced it with a Hitec HV servo using a Lipo batt. and everything was working again until another anomoly...This time the servo acted as if it had no power. Every time I started the engine, the servo would cut out. I assumed the servo was bad so I replaced it again with another Hitec. It worked fine for a while (1-1.5 months) until it too failed the same way! I've called Futaba customer support, but the gentlemen on the phone was less than professional and suggested I buy Futaba servos. I've talked with several other racers at my local track who have all had the same problem and resorted to another brand of Radio. I was really hoping I someone could shed some light on this as I really love my 4PKS and the ability to run an unregulated Lipo with my gear. PLEASE HELP!