Every new game that I start and every old game that I try and run seems to play for around about 6 days before the game becomes unresponsive. The days wont load unless I'm moving the mouse. Once this happens, I can't save the game else it corrupts. After a further one or two days in game, my Surface Pro 4 locks up and the only way to fix is to turn off the power.
If I haven't saved, I can reload the game. If I save the game a couple of days before the crash, then I can reload and it can start again for another 6 days. If the game has auto saved, then it's most likely that the save in question is lost.
I have removed all custom graphics and reinstalled the game from scratch.