If you are using the new app, Sonos has removed most queue functions. You can’t add tracks or playlists to the end of a queue or insert next etc. There is a repeat button, top right of the queue screen. I don’t know if it actually works, haven’t used it since the app update.

Thank you! That is strange. This is a new system and I’ve never used Sonos before now. I wonder why they would remove those functions...

I’ve certainly not reached the end of a playlist, but both the Repeat and Random buttons are there on the interface. Certainly the random button is working, in my experience. 

They need to sell some headphones (serious) and rushed out a half baked dumpster fire of an app update because the headphones need the app, screwed all current owners to increase unit sales basically IMO.