I agree it is an iceLink issue. The 5G iPod is quick to skip to the next song when used on it's own, only slow when skipping to the next song when plugged into the iceLink.

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2011 550xi Carbon Black/Oyster, M-Sport, Premium Package, Technology Package, Electronic Damper Control, Dynamic Drive, Comfort Access, Active Seats, Surround Cameras

2013 X5 5.0 Space Grey/Black, M-Sport, Premium Package, Technology Package, Comfort Access, Surround Cameras