Engine Shut Off Without Warning problems of the 2014 BMW 335

Every time I go from i93 mass to i90 hwy on the exit my car shuts off for 3sec and restarts the electronics. Not sure what defect or sensors are in the area that causes this malfunction. But this only happens when I take the same exact exit every single time.

Driving on 4 lane road at 40mph when 2104 BMW 335i xdrive vehicle experienced total failure-starting with the navigation screen then the entire dashboard went black and engine shutdown (all in few seconds). There was no shoulder (concrete curb) so vehicle came to stop in the right lane. Headlights were "stuck" on but nothing else worked including the emergency flashers! contacted BMW assist but they were unable to help but sent out police and tow truck. Car would not shift into neutral and was dragged onto a flatbed damaging the vehicle. This was extremely frightening! we could have been injured or killed as cars were bearing down on us then swerving as we could not warn them without emergency flashers. Before someone is injured/killed, this issue needs to be addressed starting with why does this vehicle not "fail-safe"?--I. E. , where the emergency flashers work and transmission can be shifted into neutral? thank you!!.