I wouldnt get all upset. I had my Futaba 9c do kinda the same thing. I range checked it everything was fine. I was taxiing out and everything went full throw. Kinda like it went into fail-safe or something. I brought it back to the pits and everything was real glitchy. I took it home and could not recreate the problem. I sent it to Futaba to fix it. Fortunately they did find a problem with it. There was a loose connection on the inside. I thought I was gonna have to get another transmitter, but the problem was found and fixed. This could be something as simple as that. If you get it back and they didnt find a problem then I would be worried, but if they do find a problem and can fix it, then the trans will be fine.