I am running Unbuntu 20.04, connected to Sony XM4 headphones via Bluetooth.
Sometimes the sound quality is fine.
Sometimes it becomes really poor, as though it has been compressed badly.
How can I make it give me the better sound quality?
In my Settings, the output configuration is "High Fidelity Playback (A2DP Sink).
The other option is Headset Head Unit (HSP/HFP). Changing between the 2 does not seem to make much difference.