i dont know if this has been posted anywhere else but i see that a lot of people are complaining about not being able to connect in multiplayer. the same thing happens to me after about 4 or 5 matches and i know how to fix it (at least for me). If you cant play MP what you need to do is exit the game, start up task manager, go to processes, and look for Shogun2.exe. for some reason even after you exit the game, it's still running so end the process from the task manager. once you do this you will see that steam is syncing Shogun 2 for maybe 1 or 2 seconds. start up the game again and you should be able to connect in multiplayer. also, after you do this some custom controls and settings you may have set will be back to default.

once again, sorry if this has been posted somewhere else but the only sort of fix ive seen for this are people saying to restart the game which, as in my case, did not work