Network game problem on match days

Hello,

Got a problem with a network game. I'm playing with my friend, and everytime my friend has match, he will be kicked out of the game or game is jamming after submit team, then there is only "match" on the upper right side of the screen, but he is unable to push that. I'm the host and my matches are working well. Both of us is playing with Steam so the version are same. Problem was same with previuos versions too.