I have 2 issues with his situation.
Firstly. I almost always start radio play from Sonos favourites. I simply get a message saying station cannot be played. I then navigate to Sonos Radio which tells me it has to re-authorise. So the message needs to change to tell me Sonos Radio needs re-authorising.
Secondly. It seems to need re-authorising at least once a week or even more often. This is excessive