I found that alot of the problems (mainly discconects) and crashes to desktop can be fixed by formatting and reinsatlling windows, i know this is very unappealing but it REALLY helped Me!
BEFORE: could not host H2H and when joining i get disconnected about 3 or 4 times every 10 min, and whenever i try to man guns i would get crashed to desktop about half the time.
AFTER: I can host fine, the only time i lose connection is when the host crashes, not being crashed for trying to man guns anymore.
I think it has something to do with the old 104 regestry entries and other KAFKA stuff. If your desparate might be worth doing.