Bluetooth Connectivity and Sound Output Issues in Catalina (and still in the beta)

Hi all,

Abstract: In Catalina, Bose bluetooth devices are randomly being switched to other outputs, but not disconnecting.

I'll go into detail about my setup here in case it is relevant, though I suspect this problem is widespread enough from my reading to not be specific to it.

I run a MacBook Pro and two external monitors. I use a Belkin Thunderbolt 2 dock, through which one monitor is connected via HDMI, and the other (primary) is direct HDMI to the MacBook Pro. The headphone port on the dock is unoccupied.

I use a range of Bose bluetooth audio devices. They may seem excessive, but I buy things I don't need, and it is nice to have different options. They are:

• SoundWear
• OE SoundLink
• Quiet Control 30
• Revolve SoundLink

Since upgrading to Catalina, the sound output will randomly change to something else as the primary output, such as the primary monitor (which has no sound output).

Solutions I have tried:

Debug, resetting bluetooth modules, removing any Library file with 'bluetooth' in the name in both ~/Library and /Library, dozens of NVRAM resets, SMC resets, removed WhatsApp, tried Audio Linker, all to no avail. Even just upgraded to the .3 beta hoping it was fixed. It's not.

Anyone have any additional ideas? I really don't have time for a reinstall right now, especially restoring licences for some software.