Plex hangs for like a few minutes, then resolves itself, then hangs again, then requires restart

shayanaantx! Are you hanging in there?

I stumbled across your thread because of the error you expertly located and pasted above.
Kex protocol error is serious, but not your fault, and is being addressed as far as I can tell.
I realize it’s frustrating, but we can look forward to relief if I understood correctly: