Amazon skips and reauthorization

I created a Sonos Playlist from some of my Amazon music last year.  When I go to play it, it skips tracks and there is a pop-up saying my Amazon account isn't authorized.  I reauthorize and play something else for a while.  When I go back later, 10 or 15 minutes,  same problem.  So I do the whole routine until I give up.  That is like 5 or more times.  I've had enough.  Sometimes it works and sometimes it doesn't.