systemd-catfoodd

Sorry I only have this generic troubleshooting point to offer, but have you checked to see if NetworkManager might be modifying your IP routing table in unwanted ways during its operation?

From what you’ve described I’m under the impression that no Internet traffic needs to run through this system; perhaps NM is adding an unwanted default route?

Dude come on. Make an effort. If you really haven’t a clue then start by reading the KDE developer’s blog “Pointiest Stick” and github user Probonopd and his article + links https://gist.github.com/probonopd/9feb7c20257af5dd915e3a9f2d1f2277

Bro it’s cool if your needs are best served by Windows or OS X but please don’t lump me along with childish ideologues like OP. I’ve switched to Linux on my work Desktop about seven years ago, yet that didn’t make me feel the need to go full-communist about it, nor do I hold it up as some kind of free market success story.

That’s pretty neat. There’s also an SMB client called CIFS Documents Provider (by Atsushi Wada) that’s Free (MIT License) & open source.