Sonos S2 system.  Latest updates.  Just deleted and re-added Plex; no change.  Plex software is current.  Running Ubiquiti Unifi system for network gear.

I can see my library, and for the most part, play music files from Plex.

When I try to play much larger m4b audiobooks, I see a whole bunch of ranged gets (with 200 status code) of 6144 bytes in length (For a 200+MB file) and then it eventually fails and I can’t play back the book.  Each of these gets is from a different source port on my Sonos, which I think is excessive.

I do have Remote Access for Plex enabled but do not have any ports published (for Plex or anything else).

Any idea what is going on and what I should do here?  I’d like to be able to play Audiobooks through Plex on my Sonos.

Thanks