Multiplayer keeps crashing

I know, I know: it’s such a generic problem, but I don’t know what could be causing this.

Things I have done:

-Verified game cache in Steam
-Updated my graphics driver
-Edited DefaultInput.ini to enable console (nothing I haven’t done before)
-Edited WillowEngine.ini to enable Japanese voices (nothing I haven’t done before)

This just started happening yesterday. Before that, I was able to play with my modded files in multiplayer without problems. This also only happens when I am not the host.

Any other things I need to do?

Any advice? Bump because I’m still having this problem.