What OS are you running? Win 8.1 here.
Also are you running any apps when this happens like FRAPS or MSI Afterburner... they hook into the graphics card drivers and could potentially cause something like this. Just a thought.
Windows 8.1, latest drivers (though beta). I do have MSI Afterburner running but never had issues with it before. I'll try removing my GPU overclock and see if it stops.