Are you playing the actual tracks, or starting an Artist Station?  It’s easy to tell the difference, it will say the “<artist name> Station” on the Now Playing screen. 

I’m playing the artist . You can see an example in the picture attached where i simply press tplsy key under the artist picture

Double tap on the room at the bottom to bring up the Now Playing screen.  If that says “Burial Station”, or there is no queue, then that button defaults to an artist station, which plays similar music to the artist you choose.   Not at home right now, but when I am I’ll try to see what you can do to play all tracks by a single artist.

Thanks for replying

actually it doesn’t seem to say anything. You can see below the sequence: find an artist, press play, press the room and then press next track

Actually with the previous version pf the sonos this was not happening. And of course it’s a different behaviour compared with the apple music native app on the phone