Has anyone heard of a problem with the speed sensors with E46 M3's?

My car has been in the shop 3 times in the past year. The car makes sudden breaks when cornering but steps back in line if I lift off the throttle.

I took the car into BMW of Arlington and they told me there was a known problem with the rear differential on the M3. In addition, I put new tires on the car in January and noticed that the tires had worn uneven on the inside. I have been told that the speed sensor had nothing to do with the tire wear but I never had this problem before.

Any help would be appreciated. The delaer told me not to have an alignmet done??