[NoodleKnight]

If you have a dead backup battery, it messes around with the RC. Also, when you mentioned about quickly disabling/enabling -- the RC sets every output to its default value (127 for pwm's, 0 for digitals, etc... I think), mainly for safety reasons.

In 2004 we used pneumatics to move our arm and, occasionally, the solenoids would rapidly flicker (you could actually hear it) when the joystick was moving/moved back to its center position. I just assumed it to be the joystick not fully returning to the center position, but in some occasions it just did it at random, regardless of joystick position. It never really bothered us enough to try and find the problem. But that only applies if you're using a joystick to control pneumatics.