SNAFU 4

I have noticed more and more my brakes pulsing during stops from higher speeds, downhill stops or when the car has added weight. BUT, this only happens sometimes. I have noticed it more lately during and after (especially during) long highway trips (very severe a couple times after driving 200 miles without using the brakes on the highway).
I have read through the previous discussions on this, but nothing sounds similiar. For those with warped rotors, did you notice it only bad sometimes?
Also, a warranty question. A few months back when I was still under factory warranty, I brought this up (when it was less severe). I got the usual "operating to factory specs." Any chance to bring this back in and show them the problem got worse and they might cover a repair?
BTW, my pads still have decent meat on them. I checked them all about 5K ago when I put the snows on.

Thanks all...

AlexiD12

I picked the car up and rolling to stop signs, the ABS would kick in by itself without even having my foot on the brake. Freaked me out. Happened about 3 times and I knew if I went back and yell at them again, they would tell me the same thing, "Even the shop foreman checked it out, its fine."

Nevertheless, someone on here told me that its probably a dirty or faulty ABS sensor sending bad info to the abs module. Makes sense. Luckily it hasnt done it again, I got about a year left on my factory warranty, so we'll see.