Hello Tim. Have you checked out your crystals (Tx/Rx)? I had a problem with a plane last year. After repairing it after a "hard" landing, I notice that the controls were jittery. I thought it might be some kind of interference (a microwave tower is near the field). It cleared-up after I got the plane started. So I decided to fly.....BIG MISTAKE!! As I started to turn on final for a landing, the plane continued to bank even with the stick in the center. Nothing I did with the Tx made any difference. The crystal in the Rx had been damaged from the previous crash. It must have been the vibration from the engine that finally made the it fail. The jittery controls during start-up was a dead give away (in hind sight). It was the Rx losing communication then regaining it. Long story short, try replacing at least your Rx crystal to see if that clears up the problem. $10 or $15 is a small price to pay to insure that you stay in communication with your plane. My 2 cents worth. Good luck.

Later,

Mike