That's not /really/ helpful anyway. You'd have installed an extra
application, for a wholly unrelated issue, and still have to set the
profile to A2DP yourself.

Alistair, there are messages in your logs that seem to point to a firmware 
issue:
Nov 26 16:56:25 albatross bluetoothd[1010]: Unable to get io data for Headset 
Voice gateway: getpeername: Transport endpoint is not connected (107)

Furthermore, I see some slightly unusual messages that point to an issue with 
the firmware (usually) as well:
Nov 26 14:45:14 albatross kernel: Bluetooth: hci0: SCO packet for unknown 
connection handle 0
Nov 26 14:45:14 albatross kernel: Bluetooth: hci0: SCO packet for unknown 
connection handle 0
Nov 26 14:45:14 albatross kernel: Bluetooth: hci0: SCO packet for unknown 
connection handle 0
Nov 26 14:45:14 albatross kernel: Bluetooth: hci0: SCO packet for unknown 
connection handle 0
Nov 26 14:45:14 albatross kernel: Bluetooth: hci0: SCO packet for unknown 
connection handle 257
Nov 26 14:45:14 albatross kernel: Bluetooth: hci0: SCO packet for unknown 
connection handle 257

It's possible the hardware gets confused by losing the connection that
was initially there.

I realize this might not be /so/ helpful, but have you also tried with
another model of bluetooth headphones, assuming you have something
available?

Please see if you can attach the full contents of /var/log/syslog after
reproducing the issue (with a different model or with the usual Sonys);
once you've made sure that it doesn't contain sensitive data. I'd need
to know when you started each attempt so we can see exactly how the
system reacts to it.

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https://bugs.launchpad.net/bugs/1854392

Title:
   Bluetooth headphones won't use A2DP on reconnect

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