I am a new member but I think I will become quite active, I love this site.
I read another post with this same issue but there was no definitive solution.
Problem: My Windows 10 computer is a brand new Origin PC system with Nvidia cards running in SLI. My system has rebooted already in 2 different occasions while playing "XCOM: Enemy Unknown"; no BSOD, or warning, the PC went black and rebooted. The first time this happened the BIOS (ASUS) was running in Normal Mode, the second one the BIOS was in power saving mode. I have been looking in the Internet for solutions, and I can see that many XCom users had the same issue since Windows 8.1 (I am running Win 10), but the developers at 2K games blame the hardware most of the time. I don't think my PC is the problem since I run newer and more "power consuming" and "graphics demanding" games and only XCom does this to me. Anyways, I am sharing my specs and toolbox report with you just for sanity.