I had a total transfer case replacement on my X6 with 17900 miles. I took my car in for a regular service and mentioned hesitation w/turns. They found a faulty module--they tried a replacement motor and the repair failed and did a total replacement.
2016 X6 Black Sapphire w/Black Leather
2015 328xi Silver w/Black Leather
335cxi M pkg 2008 & 2009
328xi 2013; 2007; 2004
X3 M pkg 2007; 2004