What music source are you using?

Have you tried a network refresh, by unplugging all Sonos devices from power, and while they are unplugged, rebooting your router? Once the router comes back up, you can plug the Sonos devices back in. 

I’m using Deezer as streaming service. I’ll try what you suggested and let you know.

Thank you.

Hi, I tried what you suggested. Hi also tried to unlink and link again the Deezer service using the Android app. Unfortunately the problem still persist.

Then I would recommend that you submit a system diagnostic within 10 minutes of experiencing this problem, and call Sonos Support to discuss it.

There may be information included in the diagnostic that will help Sonos pinpoint the issue and help you find a solution.

When you speak directly to the phone folks, there are more options available beyond just the diagnostic analysis.

You haven't accidentally enabled Crossfade?