I upgraded to a new Samsung S21 phone that turned out to be defective because the Bluetooth wouldn't work with my 2021 Lexus ES. I returned it and replaced it with another S21 but it had the same problem. The issue didn't happen with my S20 phone. I was told that Samsung would refund my $700 Trade Credit by three Samsung employees (including one that said he was a supervisor) said they would issue a refund of the $700 but later backtracked on their commitment. Meanwhile, Samsung has my old S20 and I was forced to go out and buy a renewed version for just under $800 which I was willing to do because of Samsung’s commitment to refund my $700. Ultimately, Samsung instead would only gave a $700 promotional credit that expires in 90 days which I can't use since the new S21 phones are defective and don't work with my vehicle. VERY UNHAPPY.
I'm having a similar issue except its only when I make phone calls. If I am not on any call the bluetooth connection remains constant.
I'm starting to see there are more and more people with bluetooth issues on this phone which at least seems to suggest its not just an isolated issue for me.