Just one other thing I can think of to add. The servo is listening to an electronic "signal" from the receiver to "know" how much to move. When a servo glitches it does not have to come through the receiver. It can also enter through the servo lead or the control board in the servo. I have personally had servo's glitch like that and changing the servo also cured the issue. I could have worked to reduce the RF noise but in my case the filters on the servo board were bad causing it to "hear" the RFI. Lot's of little things......that's what makes this soooo much fun for me.