Playlist restarts at beginning before the end

[hendersj]

I'm on a premium family account, based in the US.  I'm listening on a Mac using the web player in Chrome.

I'm listening to this playlist:
https://open.spotify.com/user/steveklug/playlist/4MfdL3JhryS03gx5zHOOoF?si=XAOF_yv6S_StY4wzpNgeFA

Currently on Symphony No. 70.

At random times, when Spotify finishes a track, it jumps all the way back to the start of the playlist for no apparent reason.

This is really annoying and frustrating - I'm listening to this music while I work, so I'll look over and see that I'm back at the start of the playlist (or on about the 3rd symphony), and then have to go and look at the history to figure out where I was, resume playback, and then have it jump back after another track or two.

What's going on here, and how do I fix it?