About anti-virus, I use MSE and already closed Windows firewall on the control panel.
I use Steam version and I tried to join others' host in lobby but stack at the end of the loading bar. Joining others' in the lobby is the direct connection way, right?
I tried 'netsh winsock reset' command already but it did not work.
About the Arena mode, we can play together with no latency at all. But the same connectivity settings did not work in story mode.
I think it's the network issue and I will try other game platforms (at least platform can solve the blackscreen issue but not stable) and find a stable one.
I think this kind of issue really troubles some Chinese players. I searched for the solution for this issue on Chinese SE and lots of people have this issue too. But there is not a uniform solution.