Regarding the bad cat suggestion some of your symptoms, like the bogging are similar to a bad cat. Many times if you get under the X listen or jiggle them a bad cat will rattle. My experience has been that the are either good or bad, they are not intermittent or change based on going or coming from work.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas