My 1-inch threaded headset sort of "locks in" to a straight ahead position every few days or so. When that happens I rotate the ball cartridges, and that makes it better, but then a good ride over a bumpy road results in "notching" again.

Question: As a somewhat heavy guy, am I simply doomed to eventually crunching the bearing balls in my headset? Or would this be an indication that the cups or races in the headset are scored? I haven't actually checked the cups or races for scoring yet. Still, I was wondering if this sort of phenomenon was easily diagnosed.