I already have a pretty good idea of what's wrong from looking through community topics but I'm going to ask anyway.   

I have a playbase set up via wifi in a home theater setup with 2 sonos ones + sub.   I had no issues for almost a year.    A few days ago I noticed the sonos one google voice assistant was not functioning.  Looking into the app, it showed 3 errors (? +sub+LS+RS) .  The playbase was missing,  even though it was still functioning (sending sound from my tv)... but surrounds and sub no longer working with the playbase.

I rebooted the playbase, no luck.  I factory reset the playbase, no luck. I got the green flashing LED,  but the add product option in the S2 app would not find the playbase no matter what I tried.

Finally I ripped my mesh wifi system apart and rigged it up to the playbase via ethernet and voila the playbase was found immediately.  So I removed all the units I have and reconnected everything to the playbase and all was good.  I then change from wired back to wireless via the app and all still seems fine (no errors, etc)...  I then unplug the ethernet cable assuming all is back up and running but no...  playbase disappeared again and I'm back to square one.   Repeating this twice, I find it definitely won't work unless the playbase is wired via ethernet.

Must say I'm a little disappointed as I believe the wifi card is shot, as I've seen happen to many on here.  

I submitted a diagnostic report.  931201136

Can anyone confirm for me this is another wifi card failure?

Thanks