I have the same issue and it seems a bit discouraging to see how far back this problem goes. I played over a year ago with a lower spec NVIDIA graphics card (cant remember the model) and had no issues then. First day back to the game now and it keeps crashing. It just reboots the pc as if i turned it off at the plug then starts back up again.
Last time however the my screens went blank and the fan on the pc kicked in very loudly, nothing happened until i held the power button in to reset it. Each time it starts up i have no crash reports.
I’m running:
Windows 8.1 64 bit
Intel Core i7-3770 CPU @ 3.40Ghz
24.0GB RAM
NVIDIA GeForce GTX 780
Currently repairing the game’s installation in a long shot to see if it helps.