when this happens to me i just reset the whole screen... Hold the volume down button and the next track button (far bottom left and far bottom right buttons) on the steering wheel for 8-10 seconds and the screen will shut off and reboot... that is the surefire way to get it working again and you can do it while driving.
Yeah, I know how to reset...
I just did not expect it to be so bad. Usually, when using the inbuilt map / navigation - sync hangs once 60-90 minutes. Usually reboots itself, but sometimes needs a poke from the steering wheel.
On android auto / car play, I didn't catch It hanging yet.