[Alpine650]

Try putting the transmission in M/S (pull the shifter knob toward you). Or try driving in manual mode and see if it still does it. I had the same problem. 2 new wheels, 2 new tires, 12 balanced wheels, replaced quibo, replaced drive train. In shop for almost 2 months. BMW engineer came out to drive it with me on the highway. Within a minute he said it is the torque converter, but it is within spec.