The TIS is BMW's technical information system. It's what all the dealers have for repair procedures and technical bulletins. I would guess that they should have known about this issue, but maybe they haven't seen any of these failures or complaints. My 2003 3.0i has 70K and the tranny is flawless. It may not be that common. If my X5 ever starts doing that and out of warranty, I won't worry about it.