this happens alot during endgame.
I have a single ship, or fleet combat an enemy single ship (must be enemy single ship) and when the fight is over the game gets stuck. i can access other screens like civilization manager and shipyard but i cant select any other ships, move the ship i have currently selected (the one i used to fight with), or end the turn.
this gets frustration because after every fight i have to save and load (the only way to fix the problem)