Got a brand new 2012 TDI sport in March and didn't do much highway driving until the car had about 800 miles on it. Then I noticed that the steering wheel shakes noticeably at speeds between 60 and 75 mph. I have taken it in 4 times for road force balancing and tire rotation, but to no avail. Sometimes it will be ok for about 10-20 miles, but the shimmy always comes back. Anyone else having these problems? This shouldn't happen on a vehicle of this quality.