I'm on my second Toyota Matrix and I love the car, but this new one (used when I bought it) is going through rotors like crazy. I replaced the first set myself while doing a brake job because they were wavy and the auto parts place I use said they were too thin to turn. Since then, I've had two different mechanic shops put on two other sets of rotors after having each set turned twice before they were too thin. Neither mechanic can figure out why they keep warping. I'm suspecting my anti-lock breaking system, but I've never dealt with that before. I do put a lot of miles on - about 150,000 since I bought the car (it had almost 50,000 then). Is this normal? Or do I have a problem?