What I think has happened is that the limitations to the Spotify API, which came in two days ago, have caused an issue in my program (and possibly yours), causing it to constantly retry an API call. (Probably to query my Spotify-created playlists, which are now no longer available.). If I look at my dashboard, I see almost 5k calls to the playlist API yesterday.

That has caused rate limiting to come into effect, and now the calls are just hanging.

Hopefully waiting a while for the wait limiting to be removed, and working out where the looping is, will fix the issue.

It may also be an issue in Spotipy, if you try to query a playlist that is now no longer available, but for which you still know the ID, such as your Daylist. Querying those playlists now gives a 404.