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My UPnP server started dropping after updating to Controller App version 8.2.2 on a Windows 10 PC. The UPnP server stops playing after a few minutes and disappears from my list of music sources. I have to keep going back to Advanced Settings, then de-select and re-select the Show UPnP Servers option to bring it back. App still works otherwise and this UPnP server was working fine until the latest software update. Current system setup was also working fine and has not been modified.
UPnP server seems to be working now after unplugging a stereo pair of Play:1s, resetting them, and adding them back as a stereo pair. Don't know if the reset was really necessary. Here's the instructions on how to do a reset if anyone else needs them:

https://sonos.custhelp.com/app/answers/detail/a_id/1107/related/1