Reopening https://en.community.sonos.com/topic/show?tid=6794715&fid=228999, as that was closed but not resolved. Same issue as was reported on LG C7 is still relevant for 2019 models (e.g. C9). Frankly, the correct solution should be that the Sonos app allows us to turn off UPnP. The feature has security implications and using separate subnets for your home network is a fairly advanced approach.
Best answer by controlav
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