Postgres client errors: Database error: insufficient data in "D" message, lost synchronization with server

I have a Postgresql sever which happens to be running on a NAS, on a Docker instance. It has worked flawlessly for years, but all of the sudden one of my client machines is having all sorts of strange errors when I query it. I know that: - The errors occur with multiple databases on the host, so not db specific. - The errors *don't* occur with other client machines, just my main workstation - A brand new Docker Postgres instance on the NAS continues to have problems, so it's not something with that docker instance - This one client gets errors when accessing the server from multiple applications (PGAdmin4, QGIS, etc.) I get different errors including: - Database error: insufficient data in "D" message - lost synchronization with server - ERROR: SSL error: decryption failed or bad record mac The only thing I've found talks about network issues, packet sniffing, etc., and it seems like it must be something else.. Is there a way to flush/reset/destroy the cache(?) of postgresql info on the client machine? Is there such a thing?