I FINALLY FOUND A FIX:
Went to System settings on my phone and went to 'Reset Options' and then reset the Bluetooth and Wi-Fi.
This deletes all of your previous Bluetooth and Wi-Fi connections, but I think it also changes your Bluetooth address.
It does, but not before my ear drums get blown out, and also the other end says the call is not clear. Also, the double tap only works if Im using the phone in Sync, not Android Auto.
Any update on this? My phone calls just randomly started doing this two days ago. I've attached a video of my symptoms.
The Mustang forum says that 6.14 OTA fixed it, but I'm not seeing any updates available for my 2021 F-150...