I've noticed about 30% of the time when I'm going over those terrible plastic-like speed bumps in my neighborhood that my ESP light activates and there is some hesitation/almost grinding sound coming from the rear wheels and transmission. Its like its having trouble dealing with wheels popping over the bump....and it stutters for a second trying to recooperate. I never had this issue in my past cars (all equipped with electronic slip protection), and can't figure out why this is happening. I'm driving an '09 A4 Premium Quattro. Anyone else experienced anything like this?