Nvidia issues; random flashes of black

I recently installed the Nvidia 320.18 (?) most recent drivers, and ever since, I have had this issue where my screen randomly flashes black, for maybe 1 or 2 seconds. I was overclocking my 680, as well, but have since gone back to stock voltages and frequencies. I uninstalled the 320.18 drivers, and resinstalled the 320.14 Beta drivers, to see if that fixes the issue. Has anyone else had this issue? Hopefully I have fixed it, and there is no issue with my card.

Happened once with 320.14 drivers, but only when I was using Firefox. Played Civ V perfectly fine. Will see if it happens again :|