Civ 5 Expansion - Random Reboots

[hroman21]

Ever since I installed the new expansion Brave New World, my computer will reboot - somewhat randomly. A few posts I read suggested it might be a heat issue. I benchmarked a few programs I run, and Civ 5 is NOT the most stressfull from a heat standpoint on my computer - and the other programs NEVER reboot the computer. I NEVER had this issue prior to this expac (Gods and Kings worked without a hitch).

My questions are:
1) Has anyone else experienced this issue?
2) Anyone solved it?
3) Any suggestions of things to try?

And yes - I do have latest drivers... .

Thanks for any helpful suggestions.

Regards,
hroman21