ORIGINAL: Gray Beard

I'm using the 9-C but I have found if I'm using extensions to lengethen the wires I have had that problem. I no longer use extensions but make my own lengths by soldering wire between the servo leads to get my length. By having the servo wire soldered i no longer need to pull the extensions and clean them so it's a winning way for me to go. If you are using extensions you may want to pull the servos and wire them directly into the RX and see if it cures the problem, if so then solder and forget the extensions.