That is what mine started doing around 8300 miles. Dealer replaced the rotor, it was warped. What was interesting, my front pads have literally NO wear, and I use them all the time, I am just judicious in application as not to heat the rotor up (and cause warping) go figure? My back pads were near gone though and they were not warped at all!
I have had front disk brakes on all of my rides for the past 25 years and none have warped rotors. I really don't get it.
ed
