Boy did I step into that one. I made the comment off the cuff and without much thought actually but yes I can see that being an issue for AP. Just like the glare off a car's chrome or windshield/windows can temporarily blind a nearby driver. Not the best thing to pull out of the air to use as an example I guess!
Going back to the OP being told his AP problems might have to do with his "screen discoloration"?? (which prompted my ill-stated reply on car color), I do not see how the yellowing of the adhesive on the MCU screen edges would affect his AP at all. Would make as much sense as saying the color of his floor mats would affect his AP. My point made better this time?!