I get issues every time I have to do a Roon update. I lose like 5 listening zones (my denon receiver usually tends to remain after the upgrade, but via airplay only). It's really annoying. I have a bifrost2 in my office, 2 monitors with speakers, a set of kanto desktop speakers, a USB headset, and a ropieeexl to a bifrost2 in the living room.
I spent hours researching the issue, messing with windows audio settings, rebooting my computer, unplugging the USB cables from the bifrost, rebooting the bifrost (which i hate turning them off), restarting the roon server, etc... nothing!
After a few hours, I would come back to my computer, and would find that all zones and devices are back up. I'm not sure if this is a bifrost issue or not. It really seems to be Roon related and its really frustrating.
I have even restored to a Roon backup and that does not help.
Now before an upgrade of Roon, I make sure that I am not sitting down for a listening session. I'll make a note to upgrade like 8 hours before I plan on using the Roon software again. The forums say this has been an issue in the past and was resolved. I can confirm that there is still something not right, and I am certainly not going to blame the bifrosts for the fact that I lose like 5 other listening zones after a Roon software upgrade.
Oddly, the bifrosts will still show up as devices under the audio settings in Roon after the upgrade, but they will never be available as a listening zone.