Game Doesn't Save When It Autosaves

When My Game Autosaves, it doesn't save. It takes a excessively long time doesn't work. When I go to Exit and save, the game gets stuck on the Saving/Loading Screen. When I close out the application and re-enter, all the work that was done wasn't saved so everything done prior to that autosave was gone and the world is back to its prior save resulting in hours of work being gone.

This happens only in multiplayer and it hasn't been seen yet in singleplayer.