the sonos app works seamlessly on my mac air. I had avoided doing the app upgrade for fear of losing my playlists, but i did it and all sonos issues with the new upgrade don’t exist. My playlists are still there. 

The issues I was having with using sonos from my iphone were that I couldn’t control volume, speakers weren’t showing up, music was playing but i wasn’t able to pause, etc. etc.

So it’s definitely an apple glitch, not a sonos one.