We ended up visiting both residences. In both instances, Sonos stopped working with Ubiquiti products. These were jobs that had been working for years.
On one particular project, the Sonos Playbar would connect via WiFi but the Sub and Play1 rears wouldn't include to make a SS area. We did all the normal things that would normally address this. We also swapped the soundbar and it still misbehaved. Once we went from the Ubiquiti network to the cable-company supplied router and added a Boost, everything worked fine (we tried using the Boost with Ubiquiti and it wouldn't work).
We don't do Ubiquiti so we don't get a lot of exposure to their networks. However, we do a lot of Sonos so i found it odd that we got 0 calls from the 100s of Sonos systems we have out there (many on WiFi) but that we got 2 problem calls in a week that had Ubiquiti networks in place.
Moral of story: If you have Sonos and Ubiquiti and things don't work, use SonosNet, a Boost and possibly a secondary network.
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