I keep losing all my saves for single player games

Twice now I start up the game and I see that all my saves are gone, its random when it has done it, I had a random 6v6 single player game going, was several hours into it, and then the next day I tried to load into and all the save is gone from the menu. I was able to load into it twice before and now its just gone. this is now the second time I have lost a saved file single player campaign, and this is making it hard to keep playing the game. is there a fix for this?