How do you keep ships on a setting permenantly? i.e Guard,sentry,attack all enemies. After a few turns the ships in question revert to stand-by mode which is frustrating if you have a lot of fleets.Ive lost quite a few planets because enemy fleets just fly past and invade while my fighters/defenders just sit there! BTW does guard mode actually work? And whats the difference between guard and sentry modes?