nVidia Shield "Your connection to the server is not fast enough to stream this video"

Same problem here. Been hoping for a fix for close to two years with no luck.
I have a Synology DS-916+ running my PLEX server and I’m using PLEX Client on my Nvidia Shield. All of my movies and recorded TV shows from my HDHomerun Quattro play perfectly fine on my KODI app on my NVIDIA shield but non of my HDHomrun recorded TV shows play on the PLEX client. I get the notoriously annoying “server too slow…” error message. Some of my movies also give this error message but not all.

I can’t understand how this has not been resolved yet, same video files on the same server on the same network on the same tv device (NVIDIA Shield) plays fine on the KODI client app but fail on the PLEX app.

So frustrated. Please help.