feels like you are getting rear ended when it happens? Happens during a 'California stop' (slow roll)? If this is the case (or regardless), try searching for how to reset the transmission adaptation here (it was in a recent post, iirc). Try that first. IF that doesn't help, then we can move on to more, ummm, expensive options.

__________________
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