atm running a verify of game cache on it see if it works
UPDATE: 2 files seemed to be missing according to steam so maybe that was the issue
Alright I have tested both skirmish and the campaign. Never of them crashed when I left the map however I discovered a new issue in the single player.
I could not get the game to save, I seem to keep running into issues don't I http://i.imgur.com/HlvZClP.jpg
Good news I managed to fix my issue by removing the COOP save files, still not sure what exactly caused those to be the issue but at least its fixed, thank you for your help Sam