Problems with internet connection while playing game

Hello, i have a strange problem which i cannot explain: Always when i play Empire or Napoleon Total War after some minutes my internet connection breaks down and cannot be restored. It can only be restored after i have quitted the game completely. That problem only exists with these both games. In other respects my internet connection is quite good and returns, if interrupted, after a few seconds. Can somebody help me with this problem?

Update the firmware for your modem/router. And update drivers for your network card. If that doesn't help I don;t know it either.

If it's a case of you can play one multiplayer match and then you lose connection entirely try verify the integrity of game cache in the properties menu.