Definately has to be something. It has happened to me a couple of times. Start by taking a good look at your parts. Once mine had a build up of sludgy oil, and the other the little plastic piece that holds the return spring was broke, but was hard to tell. Its no big deal, I guess, if it happens once, standing next to the truck, but a bunch of times during a race or at the bottom of raveen is. It will be an easy fix in the garage. Oh yeah, there's a real thin washer that goes on last. It goes between kicker and case. It is the only critical piece that can be hard to remember where it goes during reassembly. Good Luck