I experienced this problem several times. When I warped in my ships into a sector, some ships are warped inside the asteroid belt. Therefore, the ships either stand still and wait for the enemies to blow them up or move and continuously collide with the asteroids inside the belt, destroying the ships themselves.
This problem mainly occurs when the pirates come to me and my ships are warped somewhere inside the sector, but not when I go for a fight and the ships are warped along the rim of the sector.
Hopefully, this problem can be fixed and thank you for your attention and effort!