Sounds more like bad video memory than driver issues to me.The whole screen will fill with what looks like small checkered pattern of green and everything will freeze for about 10 second and then my machine recovers from the driver crash and i can do everything as normal again, and there's a little windows pop up bubble that shows up telling me the drivers stopped responding.
Well i have had the problem since i got my VTX ones.. Then found a guide that shows that on idle the core drops to 157mhz and as the memory stays at 1200mhz it causes it to crash. Mine has been working fine recently and what i did was create a profile in CCC then browse to the *PROFILENAME.XML file and modify the setting from 157000 to 300000 and it has not crashed since..