YouTube Music suggests random playlists on the homepage. It seems to somehow both suggest music I don't want, and keep feeding me songs and artists I've already

YouTube Music suggests random playlists on the homepage. It seems to somehow both suggest music I don't want, and keep feeding me songs and artists I've already listened to too many times recently. And it shuffles my supermix and discover mix's contents, and discards and recomputes my "Up Next" list seemingly at random. Any time I see a song I like, I have to save it or else it will probably disappear forever.