I had just started a MP match. I was playing Tyranids, and all of a sudden, when I gave a Reload order to one of my escorts, the game took me back to the Main Menu. No error given, no Victory/Defeat screen, not even some delay in this change: in less than a second I was at the Main Menu. If I clicked on Battle, I could see the fleet selection screen for split second before being inmediatly taken back to the Main Menu. This is the first time I get anything like this.