I am a long-time Sonos user and have quite a bit of content saved in My Sonos. Must of the content is composed of links to songs and albums in Deezer, my primary music service. Several days ago, while attempting to browse Deezer, Sonos informed me that the service was no longer active and that I would need to re-connect to the service. So I proceeded to delete the Deezer service and re-add it, which completed successfully. However, when the service was deleted, all of the links in My Sonos became instantly invalid (i.e. they are now greyed out). Re-adding the service did not re-activate the links and I am now faced with having to re-create the entire contents of My Sonos.
I don’t recall ever receiving a warning that My Sonos links could be wiped out like this. And there has never been a way to back up the My Sonos content to avoid an unfortunate event like this one. I have always been a happy Sonos user, but not so much any more.