When you have both WiFi and Bluetooth enabled and successfully connect to CarPlay/Android Auto, you may notice that Bluetooth disconnects automatically. This is normal behavior - here's why:
How the Connection Works
Turn on WIFI and Bluetooth at the same time
Initial data exchange occurs through Bluetooth
Automatically switches to WiFi for screen mirroring
Bluetooth disconnects automatically
Important to Note
Screen mirroring relies on a Wi-Fi connection
Bluetooth cannot support screen mirroring capabilities
Bluetooth's only role is to handle the initial data exchange