What have you tried, to rectify this?

I would recommend:

• Turn off the router. 
• Turn off the speakers.
• Log out of your app. Close it.
• Turn on the router, let it fully boot up.
• Turn on each speaker one at a time, waiting for the white light before moving to the next one.
• Open the app and log back in. 

That should be a lot less hassle than spending time lobbying your retailer. 

Doh! Of course I have tried all those steps many times. I am still in the same hole.  Lobbying retailers to stop selling Sonos is my act of philanthropic defiance to corporate incompetence and arrogance

Why “of course”? I don’t know you or you level of competence.

Are you someone of significance? Why are retailers going to care what you think? 

You could just wait for the fixes to be rolled out. 

So you’re not actually asking for help; you’re just expressing your frustration to some fellow Sonos users. 
 

Thanks for sharing. 
 

It’s odd, though, that some folk are reporting that their systems are working just fine. 
 

I won’t wish you good luck with your lobbying but I do wish you well and hope your system improves soon. 

I used Bose for over a decade.  Then their software apps deteriorated so badly that I outfit my entire house with Sonos two years ago.  App was great.  Far superior software to Bose.  Never a problem.  Then the new app came out several months ago.  Has to be the worst piece of software every released by a major company in the history of software.  Worked okay at first, but went backwards in ease of use and functionality from the previous version (who actually approved the changes?).  But then it just stopped working and rarely can find my speakers.  Every time I leave for a week of business travel and come back, it cannot find my speakers ever.  And I waste hours of time trying to get them to work.  I have given up, and only use each one of them with bluetooth now.  Until I get a new system.  This company is utterly pathetic.