Two days ago I played fine. Yesterday I got kicked right into the menu when I played online.
I got into a lobby, started the multiplayer game, about 5 sec. to 2 min. I got sent to the main menu. I rehosted and my friend said I quit (Has left the game. message showed when I got kicked)
I tried reinstalling the game but still getting kicked.

Help!!

No one has any idea?!?!

I get this problem too, except that its always about 2 game-years into the game. It's when I host too, but I tried switching hosts by quiting the game and rejoining and it still happened. My case is only different because it only happens when I host the maps that I've edited. If anyone has a solution that'd be awesome, of course. I really want to use the maps I've edited in map editor.

There is a solution to this problem. Many people complain about getting kicked to the main menu during a game, and to fix that, simply put water around the whole outer edge of the map in map editor. I'm talking about river water, not using moats. Click the second smallest dot for the size you want the river to be, and click all around the map including the invisible, black pixel layer. If you don't know what layer I'm talking about, try building any building as far as you can to the side of a map in map editor. The reason this problem happens is that the wives and children from houses get stuck in the extra, invisible outer pixel layer of every map, so the game slows down and eventually crashes. Hope this makes sense. It worked and still works awesome for me.

Thanks for taking the time to post your resolution. =)