I think I'm observing the same behavior on mine. It seems it even got slightly worse when I put the winters on. Would love to hear some feedback.
Current - 2015 F15 X5 50i, Mocha Nappa, M Sport Wheel, Night Vision w/ human recognition, Harman Kardon
Retired - 2011 F10 550i xDrive
Retired - 2009 E91 330d xDrive