Macos will connect to my headphones for the first time and use AAC.
On further connections, it will switch to SBC and the quality is beyond terrible.
The only solution I have found is to 'forget' the headphones in question and then reconnect them, as a brand new connection pairing brings the quality back to AAC.
I have double-checked with Bluetooth Explorer that my options are correct and also checked with other headphones. It happens on both pair.
I suspect that it has to do with the headphone microphone, but have had no real permanent luck trying apple's vague advice to quit offending applications and switch sources etc, advice I found here.
Does anyone know a permanent fix to stop the continual audio codec downgrade?
I'm not sure what version of OS X this began on, but it has been several months now at a minimum. I am currently running 10.15.1 on a 2017 touchbar macbook pro.