During the battle, I wanted to save my captured ships from sinking. I exchanged the ships and my captured ships was nearly sunk and wanted to exchange the ships back, but when I did the game crash. I went in the game again and captured ship on which I was in had already sunk. Then i give my ship order to escaped from the battle and ship escaped. When I left the battle and saw that my ship was lost durability.
A few days ago I had the same problem, but my ship then as well sank.