Our 2013 does the same thing. It also seems like it lets the torque converter slip to the point that it feels like a CVT sometimes (RPM will hold almost constant while car is still accelerating). Only happens for a mile or two after cold starts, particularly when its below freezing.

As noted above, seems like BMW programmed it this way to decrease warm-up times, and can be 'tuned out'.

A Rod Sutphin Trans tune is on my list, along with many other things..

__________________
~Scott

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Black Sapphire Metallic/Sand Beige '13 E70 35d, SP, NAV, Tech, Comfort Access/Seats
20" Style 214's Wrapped in Continental DWS06 Extreme Contacts

(SOLD) Alpine White/Sand Beige '06 E53 3.0, SP, PP, CC, RC, NAV, Sat Radio
19" Style 63's Wrapped in Bridgestone Dueler HP Sports-- Summer Shoes
18" Style 131's Wrapped in 255/55-18 Nokian WRG2 SUV's -- Winter Boots