Guild Wars 2

So I’ve been having this problem for a long time now. While playing GW2, my screen randomly gives black or white flashes. They are really short, perhaps even 1 frame. Not all of the screen seems to be flashing, rather some arbitrary part of it. I have updated graphics drivers and my system generally runs GW2 with ease and high FPS on high settings. Does anyone know what could cause the flashes?

Any loss of signal showing from your monitor ? Check your cables, ( also for defects ) and check if your GPU is seated correctly,otherwise pull it and reseat it correctly ( do not put to much pressure ).