Mine were replaced just a couple weeks ago. I have been fighting with mine for a year now. But I took a 8 thousand mile trip through ALL kinds of weather from 33 to 112 degrees. Mine warped because my calipers weren't releasing all the way. I am certain that's what it was. I spent about two hours in California at a NAPA store trying to get them to stop dragging. I never did get them to completely release. I didn't want to break down the calipers and have to bleed the system in a parking lot, bikes loaded, and baking in the sun.
The local Kawi dealer wouldn't even discuss it. He gave me a piece of sand paper and suggested I 'rough' up the rotor. I kept the sand paper, and knew he was cracked. Two days after I got home, the dealer had it. Replaced the warped rotors under warranty.