This has been happening quite a bit since the 500 series of cards for Nvidia, I started having problems recently with my gtx 570 where display drivers would stop responding, contacted Nvidia and after getting a lot of BS answers, I finally got someone that said they are aware of the problems, but singling it out can be time consuming. It can be a hardware issue, not a big enough PSU, card going bad, not enough airflow for the card, hard drive issues, corrupted files from windows updates, TDRdelay issues, problems with your physix and 3d settings, old BIOS drivers. If you have made sure it's not hardware related, updated all your drivers, found the most stable drivers for your particular card, increased your TDRdelay, reinstalled windows, and adjusted all your settings, I would suggest trying to get the manufacturer to exchange your card because about the only thing left I can think you can do is underclock your card, and that defeats the purpose of paying for the card you bought in the first place.