I looked at that weird part but couldn't find anything like this. There are similar problems but not this one. I just formatted my pc so all drivers are new. Once network connection lost, I have to reboot my modem.
Then it is probably one or more of:
A. A bad network cable between the modem and the router (assuming you have a router, or the modem and the computer).
B. A bad connection to the cable/DSL line (flaky cabling or a bad splitter in the way).
C. Something flaking out on your router. It could actually be some sort of "intrusion prevention system" in your router freaking out over the incoming network connections, and then blocking the "dangerous" server (your PC) from accessing the Internet. If your modem also serves as your router, then it would all be in that box. Until I got it properly configured to allow MC's traffic and ignore it as far as the intrusion prevention system, my firewall would often "trigger" on MC's WebRemote, WebPlay, and remote Library Server connections.
D. A broken modem.
Just because using MC causes the problem to manifest, doesn't mean that MC is actually
causing the problem. Using MC's networking system could be exposing a weakness in the system and causing it to fail. If you don't have to reboot Windows or even touch anything on Windows to get the problem to go away, then it is almost certainly a hardware problem, not anything in software on the PC at all. This isn't ABSOLUTELY true, as rebooting the modem could give you a new IP address, and so that could change things in software, but I doubt it. I'd start with that list and go from there.
I'd certainly replace the network cable between your modem and router and the router and your PC (again, if your modem is your router, then just the one between it and the PC). That's a fairly likely candidate.