I had the same thing with my 2008 3.0. Random blip, like a hiccup. It then on occasion threw a CEL. By coincidence, my car f-ed up one day with the AC on and was running pretty rough. I had one bad coil pack and replaced them all along with both vanos and all the filters and plugs. I also replaced all of the intake manifold gaskets because it was an easy job and I was already in there. It was perfect for about 20K and then randomly had an exhaust vanos code, loss of power and just ran a quick reset because I didnt feel like dealing with it in the snow and cold. Before I had the opportunity to dive into it, the car was totaled in a head on in December 2016.

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2010 X5 3.0 X-drive Titanium Silver/Black
2018 Ford F-150 Platinum Crew
2010 528xi (His)
2017 M2 Manual (His)

Former Headaches:
2008 X5 RIP
2015 M235
2013 135is
2009 535xi Wagon (JUNK)
2007 530xi 6spd CPO Sport (Best Damn Car EVER)
2011 335xi M-sport Coupe 6spd (Sex on Wheels)
2010 550GT "CPO" (Junk)
2012 X5 35d "CPO" (More Junk)
2004 330i ZHP Sedan
2002 325xi Wagon
2000 323i Sedan
1998 M3 Sedan
1992 325i Sedan