So... got attacked by a ridiculously larger force (they had I think 80 capital ships? nevermind smaller ones...)
So I decided to use new "disengage" mechanic, so I grabbed my best ships, parked them all near the bottom of the map telling them to defend a point there and slowly chipped away the enemy fleet.
It worked perfectly... until one captain at each side of my fleet, decided it was great idea to split off and wander off, the arrows on the map still showed them "going" toward the spot I told to defend, yet they both decided it was great idea to fight alone... one of them ended having to fight 4 onslaughts at same time, I manually clicked that guy, told him to go back, instead he used his ship special to jump into one of the onslaughts and got himself killed instantly.
Thing is, guy wasn't reckless, none of my captains are, yet this happens often, they just... lose track of what they were supposed to do and wander around.
So any way to fix it? Also, any way to tell my ships to keep a formation? Another issue is the opposite: a few times had some of my fleet ships that can phase decide that the best course of action is phase in front of my artillery line of fire, or outright phase into the middle of my formation and get killed by collision damage with my own ships.