I had the screen turn black with a white BMW logo in the middle once. Happened out of the blue after stopping the car at the side if the road.
Radio was working, but not in the hud. No navigation or climate menu either just black with BMW in white letters.
I had to turn the car completly off a few times. Then i went out locked it and waited for everything to turn off. Not sure what fixed it, but it did not come back until i stopped and did the turn off everything trick. Drove like 15min before deciding to stop..