3 weeks? Four times? Still not fixed? I would be ticked off too.
I just got a call from Sonnen -- issue is more complicated, still diagnosing, we'll get back to you tomorrow. Said he got me a loaner because he figured it was going to take some time to figure out. That, and based on what you report, has me pretty concerned. Last thing I need is to be flying over Waldo Grade ... or sitting in the left lane on the GG Bridge ... and lose the ability to control the car. I was thinking this was some issue with the DCT tranny on the 1-series, but given that it happened on an X6 it sounds like its a much bigger problem and -- based on my guy saying he knew immediately that it would take some time to address -- one that it seems BMW is pretty familiar with ...