So i have an AMD Radeon R9 200 Series graphics card and in many games like WoW, HoTS or Neverwinter online the graphics on my screen flicker. There usually appear black boxes in front of other stuff and they flicker. One way i have found to fix the problem is to change the overall graphics settings through the in game menu and then change it back. At least that is what works in wow and hots. In neverwinter online the problem was persistent and didnt get "fixed". It has also happened once during a youtube video in full screen where a thin greenish line appeared every 2 to 5 seconds. Any idea on what is causing the problem or a fix it? Is my graphics card faulty?