A few of my func_illusionary's disappear in-game from certain viewing angles and distances. They just vanish. I move to another spot or turn the camera to a different angle, and they reappear. Huh? The entities are covered by clip brushes, but that shouldn't be causing it. I fear this might be a sign of a video card going faulty, but I REALLY hope it's something else. Can anyone help?
edit: I have the latest gpu drivers and the latest directx