I've noticed that when my A4 (B5) 2.8Q is in 2nd gear at 2,200 revs it drops to 2,000 again before accelerating as normal up the powerband again. It happens both in Auto and Tiptronic modes. It's only 2nd gear all the rest rise as normal. Whats even more bizarre is that it's only on the initial change up from 1st to second, so once it's happened and then I slow down in 2nd from 3,000 to say 2.000 and then increase speed again it doesn't happen.

Any ideas? Anyone else had this? Im baffled that it's only 2nd gear and only happening on the initial rev increase!