Disconnect when using main gun

When I log-in I only get to use my main gun for one game, meaning I play one game and everything is fine and then im about to play again, i shoot my gun and it freezes then sends me back to desktop and it dosent tell me i diconnected either. This has been happening ever scince i started playing. I dont know what to do, iv'e re-installed it and i asked people on the game and no one knows why it happens. Please help me. Thank you.