I just updated to 80.01.08 on android and iOS latest. It has not fixed my issue (unable to add any service from iOS or android app, in particular Apple Music)

I didn’t see much difference from version 80.01.11, which is probably what was to be expected from the changelog:

https://support.sonos.com/fr-fr/article/release-notes-for-sonos-software-updates

Nothing useful,  unable to add sistem persist, (last week the for iOS there was an update to update after only 3 Hours)

I managed to get my particular issue resolved, details here:
Cannot Add Services (Apple Music) in New Sonos App | Sonos Community

You’ll only see improvements by continuing to keep up with the updates. That is the purpose of the updates.

There is another thread on this.

The update on Android feels slicker and it seems to handle the “system not found” issues better which I think is achieved by simply not issuing the message until more checking has been done.