Fox shock “clunk”

I have a newish 2014 850 and recently finished my first real sport ride. Got out on fathers day and did some fast trail riding. Had a blast. I used to race quads and forgot what I was missing! Anyways, almost every time I pin it to wheelie over an obstacle I get a big clunk in the front end. It sounds to me like the front fox shocks are "topping out". Has anyone else noticed this or should I look for something else?. My rig only has about 300km on it.