I had this happen on my '17 Mustang with CarPlay before. If I remember I believe I removed my phone as a device from the radio and the reconnected it and it detected it as a new device.I have had my JLUR for 4 days now. The first two days CarPlay worked great but now it does not show up when I plug in my aux cord. I have the 8.4 Uconnect. I have tried multiple cords including genuine apple cords and also used multiple usb locations. The USB port is charging my phone just fine but CarPlay never comes up. Any help from the forum members would be great. Maybe someone has already figured this out. Thanks