It's Parkinson's servo-disease.

Seriously, it can be caused by a number of things.

1) bad electonics combo/incompatible electronics. Some require you to swith the red and white wires on the servo (or esc)

2) radio interference. Do you live near a Ham radio operator or broadcast station?

3) cell phone interference. Nextel's the worst. Leave your phone in the house.

4) electronic/magnetic interference. Are there large powerlines near your play-zone?

5) prankster neighbor. Is someone else on your channel nearby?

6) Is your radio on? Are the batteries good? Is your receiver pack charged?

7) receiver antenna wire. Is the receiver wire in good shape and intact? It HAS to be the factory part (lenghth, diameter, gauge, material)

8) Is your receiver and antenna near any servos, metal moving parts, ESC, or motors? Are all metal-to-metal parts on your car secure? (place shrink tube over the brake rod where it fits in the lever loop to elimate interference)


One simple solution is to get Novak's "glitch buster" capacitor. It helps.