A possible cause can be wifi interference

Well, I don’t think so. It’s happen frequently on old playlist 

But why do you think that wifi interference cannot influence an old playlist?

Read more about music service stopping here

Skipping through tracks on playlists in this way usually means the audio buffer on the speaker is emptying - so it’s the wired or wireless connection (possibly) to the player. I’m assuming that your internet connection is working perfectly okay and there are no current outages with the Deezer service.

Just need to know a bit more information about your network and Sonos setup before suggesting how to best fix it. 

What’s nearby? If using WiFi/SonosNet or a direct wired connection? Type of router, any WiFi access points or switches? - just the basic info. may help.
 

Ken, I’ll come back! Thanks!