Thank you for your post and for your patience as the team investigates your report.
As the moderators pointed out, there was a known connectivity issue affecting Sonos S1 and S2 firmware devices running 15.2 that was resolved with 15.3. The issue manifested with the same error you’re receiving when users attempted to play back to individual or grouped Sonos Zones via the Sonos network protocol in Roon. Using Airplay was a workaround to the issue. You can read more here: Sonos - “Roon lost control of the audio device” after Sonos Update [Resolved: Update Sonos Firmware]
If you’ve updated to 15.3 and are still encountering the error (as well as Airplay connectivity issues, then the trouble likely stems from networking issues and not the since-resolved Sonos bug. I recommend rebooting your Sonos devices once each to be sure the 15.3 update is fully in place.
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You mention that some Sonos devices are ethernet-connected, some are WiFi. Do you have a mesh network in addition to the UDM Pro router? If so, how many access points do you have in place?
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Is there a second router in addition to the UDM Pro (like an ISP-provided gateway, for instance)?
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Do you have UPnP enabled in the UDM Pro? What about multicast DNS? These options are likely available in the router’s settings and both will need to be enabled to support Sonos/Airplay streaming.
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We’ve taken a closer look at automated diagnostics sent to your servers from your Nucleus+, and it appears routine outbound requests from the device are often failing due to unclassified local network errors. It’s possible this is the result of a firewall or other network security in place. Are you using a VPN, by chance?
We’ll keep an eye out for your response. Thank you!