ME TOO! I have been in touch with customer support and they have no clue! They recommended I talk to an engineer which involves calling Russia because I cannot travel at the moment (because of COVID) and no one can help me here. It happened randomly one morning when I suddenly couldn't use my airpods anymore and my Apple watch is now essentially useless without the iphone bluetooth.
It is something wrong in my settings app as the app is constantly freezing and won't let me do anything in it without taking minutes to sort its self out.
I am getting fed up with all of this, I am having nothing but trouble with the software at the moment in one way or another and the fact that the customer support is trying their hardest to help me but have no idea what's wrong is frustrating.
I am using an iphone 7.