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No one has mentioned it here yet, but I recall reading somewhere (I think it was in an old post on the topics of brakes), that you can have warped rotors that when measured cold are not warped, but when hot, they are.  This phenomena works in a thermal runaway mode.  The warping can begin small due to uneven heating.  Then the small warpage changes the amount of braking you get on the cool vs. the warm part of the disc.  Thereby further heating the hot areas more than the rest, causing more & more high temp warpage.  But then when measured cold in the garage, you still have a non-warped rotor.