Quote Originally Posted by daz32 View Post
I wonder if the latest iOS update will solve your issues..

If you’ve got a new iPhone — the XR, XS, or XS Max — and have found that it can unexpectedly disconnect from CarPlay when in your vehicle, iOS 12.1.3 should get things working as expected again

Apple’s new iOS 12.1.3 update fixes annoying Messages and CarPlay bugs - The Verge
Hopefully! thanks for letting me know