I really don't know how to explain this clearly, but I'll give it a shot. While playing Warhammer and WoW I notice that my screen gets a notch brighter every time my character begins to walk. When I stop walking, my screen goes back to normal. The brightness change is very small, but it is still big enough to be an annoyance. Could the monitor be defective or maybe there is a setting I can change to fix this?