Interesting issue this morning.... I was about to leave the house and used the Sonos voice assistant to ask the Sonos roam to stop playing music. Got the error beep and it kept playing, asked again and got the voice response of no music is playing. Here's a video to the problem : https://photos.app.goo.gl/AL9RGy1TDbNiewjJ6

Also here's a screenshot of the Sonos app showing that music is playing in the kitchen: