I checked all of the linkages and charged the receiver battery right before the final flight. There's only one thing that I can think of that was different than the first, 60 or so trouble free flights I've had with the heli. When I originally installed the servos, I used the rubber grommets, but not the metal eyelets in the grommets. I read somewhere that you should always use the metal eyelets. So, I loosened off the cyclic and tail servos and put the eyelets in the grommet. I checked for movement in the servos and didn't see any. Could the metal eyelets be transferring vibration to the servos? With the engine not running, I checked to see if the servos were twitching on their own but there was no sign of that. I don't think it's a range issue because the heli was acting weird when it was only 20 feet away from me.