check for sticking pistons in one of your calipers. i had a similar problem in another vehicle and discovered it when i had installed new rotors and pads. one wheel got abnormally hot to the touch. turned out that one caliper had a sticking piston which probably caused the original warping problem.
1993 300e-2.8 - gone now <sigh>
"Do not adjust your mind, it's reality that's malfunctioning"