What pads do you have? My brembo cross drilled/slotted rotors warped in like 8 months. I had Hawk +'s at the time. Now i'm on brembo blanks with oem pads and it feels about the same and now I don't have to clean my rims so often.

I just noticed you said your rears were the ones that were warped. Do you park on steep hills/driveways? There's alot of reasons why it might have happened such as: excess E-braking, having the E-brake on too tight especially after hard runs, uneven cooling when in contact with water. (spraying the rotors before they are cooled down) etc, etc.