An error occurred while attempting to play this video check the connection and try again

I’ve tried to find a solution here after browsing through several threads, but haven’t seen anything:

Plex No Longer Working on Amazon Fire TV STick
An error occurred while attempting to play this video check the connection and try again
Error Occurred While Attempting to play this video. Please Check your connection and try again

My issue is similar, in that I get the “an error occurred” message trying to play videos remotely from a friend’s server (so unfortunately I don’t have the ability to share logs or make changes server-side) on my Amazon Fire Stick (2016 Basic edition). That said, this has only recently become an issue for me, and only specific to my Fire stick; Plex works on my iPhone (desktop site/Safari), Samsung TV app, and on Firefox or Chrome on various PCs.

My friend’s PSM is version 1.24.1.4931. Here’s a log of what’s happening on my Fire Stick:
plexLog.txt (613.7 KB)

Any updates or advice here?