If you are in Vegas, take it to European Motor Cars and ask Shelina to have Adam inspect it.

Flex disc, center driveshaft bearing, etc. could be bad. Hopefully it isn't the torque converter, though it possibly could be. If it is, you'd want to repalce the flex disc and center support bearing anyway while the trans was out, so no harm in having those replaced if Adam says that they are bad.

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Kirk
Las Vegas
2016 X5 40e Mineral White/Black Dakota Leather, ZLL, ZCW, ZDA, ZDB, ZPP, multi contour seats, rear side window shades, HK stereo
2011 E90M3, 6-speed manual