DANGER!!!!!! I lost a plane that did the same thing. I found out after the crash investigation was over that I had a bad switch. Check that out and check the voltages and loads to all your servos too. I use the Hanger 9 Digital Servo & Receiver Current Meter. It works pretty sweet. The last thing is that if you are reusing a reciever from a crashed plane your crystal could be cracked. Check it out.