When playing Endless space for the first time, I lost several systems without a notifacation until it was to late to do anything.  This should be fixed because they are crutial events that take place and in some casses are unavoidable because of "Reasons" that you, the player, have made and it is justifyed, however this unadalterated lack of notifacation is inexcusable for a 4x game such as this.