I used to get this problem, but I managed to fix it somehow on my other project, but the one I'm doing now I can't render anything anymore. I tried unticking square samples, playing with square sizes, nothing. I got told to check for Nvidia driver updates, there was one, installed it, still nothing. It seem to work again when I quit Blender, reload the project and render it again, but after 100 frames, the error appeared again. Help me please.