my service guy told me to pop the fuse for the unit and that will reset it. I was a little nervous about taking out fuses on my brand new car, but it did the trick. I'd likely take the R8 to the shop and let them deal with it. Likely a quick fix though. The RS4 has been good ever since.

PeterH
'08 Phantom Black/Black R8. Carbon Sideblades. Carbon Engine Kit. 6-sp
'08 Sprint Blue/Silver RS4 Cabrio