I have the same problem with Sony WF-1000XM3 and Ubuntu 16.04. I realized that when the headphones connect automatically, they don't appear when running ``pacmd list-sinks``. If I disconnect and reconnect them manually, they do and a2dp is used.
I wrote a couple of scripts to automatize this and temporarily circumvent the issue.
I have the same problem with Sony WF-1000XM3 and Ubuntu 16.04. I realized that when the headphones connect automatically, they don't appear when running ``pacmd list-sinks``. If I disconnect and reconnect them manually, they do and a2dp is used.
I wrote a couple of scripts to automatize this and temporarily circumvent the issue.