Hello I have the same problem. It sometimes detects and sometimes no detects..  I really regret to do this upgrade which is a big bullshit !

David this is how I feel most days with this stuff. It’s become a real joke in the house but it’s not funny at all is it. I’ve spent more time sorting these tech problems out than any other tech I’ve ever owned and I’ve seen a lot in my 50 odd years. You are right to voice an opinion having owned the product and as I suspect sat on the sidelines thinking it will get resolved. After all Sonos isn’t a start up tech company but was a mature player with quite brilliant products that just worked. Their inabilities are becoming very focused and despite the obvious differences and difficulties there must be with tech today why have they decided to so boldly alienate their customers, impact the profitability of the company and ultimately jeopardise their future and our expensive purchases going forwards. Probably an answer would be to find a credible suitor to seriously invest. Possibly a fruit company would be helpful as despite the ease they suggest these tech items are to use my experience is that they require a very good understanding of WiFi, routers, apps, etc etc etc. That isn’t going to be a good model going forward. One mantra in business and life I have that’s served me well is K I S S. this stuff is far from that. 
Keep on pressing away, positively as you have been. They have no choice but to lean right in and put this right. 

It has been ENOUGH.   Enough timeless, unpaid hours of my precious time I’ve spent, weekend, night, money, changing routers, adding eeros to try and fix it.  Thinking it was my fault.  When it had been Sonos stupidity dumbing down their system with careless releases of updates.   

Just wanting to add my voice. The new app is terrible. It’s unreliable, unintuitive and unstable.

I have Sonos through out my house. It’s now next to useless. 
 

so disappointed Sonos have not rectified their monumental c*** up.

Moderator Note: Modified in accordance with the Community Code of Conduct.

Sonos, are your people reading these posts and more importantly are they doing anything about it.  I invested in the Sonos speakers system many years ago and up until recently enjoyed using it, recommending it to friends and family. I now find myself reluctant to even attempt to use it and embarrassed to mention the name Sonos. All in all I feel let down by Sonos and helpless to anything about it as I am sure do thousands of of others World wide.

I have experienced many of the problems with the new terrible app including playing music in the wrong room, random volume etc. etc. ( please, Sonos, don’t waste your time attempting to sell me headphones or anything else. You are wasting your time and more importantly more of mine!).

latest problem is that my playlists now include tracks that I haven’t added and that’s very, very annoying!
 

If anyone can help I’d be grateful 

 What playlists?  Sonos playlists?

Thanks for responding. It’s the Spotify playlists that I play via Sonos. Some of the playlists seem okay but others now include loads of random tracks that I’ve not added.

I'm done. Eight years of loving my Sonos system of 7 products ruined by the terrible implementation of a new app that doesn't work properly with no end in sight. Has it improved with "fixes"... yes but not enough. 

I've sold all my Sonos gear and never going back.