I hear where you are coming from quality wise. But you're expecting a third party app (XM) to work flawlessly via a third party system (Apple CarPlay) integrated in the primary vehicle unit. It's just not going to happen. In my experience even Apple Music/Spotify work intermittently (it will restart from where it was left off one time, but not the other, and I can't for the love of me, understand the condititions that need to be met in order to have any sort of consistency there). I've given up listening to XM via Car Play and resorted to the vehicle built in XM capability.