I recently started replaying HW1, and HW2RM campaigns with the latest 2.1 update, and on occasion random ships freeze in place, refuse orders. More, or less they are stuck, and become sitting ducks. It is totally random. could be strike craft, frigates, cap ships, or all of the above. No matter formation, or tactics.
The AI seems to have similar problems. Especially during the Kadeshi missions. Multiple strike craft just frozen in place. On top of my own ships.
I have replayed a number of times, and similar instances happen with random units getting stuck, or freezing for no reason at all.