My 2004 X5 3.0 did the same thing for the first couple of years. I finally found a tranny control software upgrade discussed here in the forums. After the upgrade the throttle issue was gone. Now, you've got a newer model that I do but my guess is the "fix" is really just for those complaining about it and not necessarily being put out in new vehicles. Take it in and describe the problem. I'm sure the dealer has a software application to cure it.