This has been happening to me too. Wireless carplay on my f-150 has been like that since I picked it up in July and its very inconsistent. I have no idea what makes it happen. My solutions is either to go into the settings in the truck and disable carplay and then re-enable it or if I am already driving before I notice I hold down the volume down and seek right button and it resets the radio and usually the music automatically kicks back on. sometimes I will go three days where it does it at least once a day and then 2 weeks where it works without issue.