I've experienced a couple of blank screen scenarios when using CarPlay. The head unit was unresponsive and nothing seemed to work except for turning the car off and on again. I actually had to pull over leaving my parent's house the other day. Certainly I hope this is a bug that can be fixed.

 

Any time the owner's manual mentions restarting the head unit, it says to turn the car off and on. Obviously that's not practical if you're driving. Does anybody know of a secret way to reboot the AppRadio 4 without shutting the car down? Thanks.