I've had a spotify account for quite a while now and have been collecting songs under "your music" for quite a while - I don't know how many songs, but it's a significant amount.  I recently got a Google Home Mini, and when I ask it to play music, regardless of what command I give it "shuffle spotify", "play my music", "play saved songs", etc., it will only ever play anything off the thee most recently added albums over and over again.

I can temporarily fix it by going onto my phone, picking something else, then going back to 'songs' and shuffling again, but it eventually winds up back on those three albums again even if I don't change anything.

Kind of defeats the purpose of collecting and shuffling a bunch of music if it only doesn't actually play any of the stuff you've collected.