every time after I joined a friends lobby and we start a game the text in the top right corner says "trying to merge our lobby with another". Then I get kicked out of the lobby. This does (almost) not happen when I open a lobby, though it takes bloody ages to find any players. I forwarded all ports, NAT type open, PC system.
You must have a connection problem then. If it says that your lobby is trying to merge with another, it mean that it's trying to make two lobbies into one and that there wasnt enough people playing the playlist to have a lot of lobbies. Hope I helped a little. Rambo362