Hey everyone! As some readers may have seen from my previous posts, I was one of those who fell victim to the yellow splotches in the bottom left and right corners of my screen. My splotches seemed to develop over night, but then vanished a day later. I have now pinpointed the discoloration down to heat activation. I use the app logmein, which tends to heat up my iphone even when the screen is off. I have tested this out now on 4 occasions, I let my phone go completely cold and then I launch the intensive app, my phone heats up and the discoloration appears. I let the phone cool down for about 2 hours and it disappears. I tried this on a friends iphone 4 as well. He magically developed the yellow splotches as well. He was extremely pissed when he saw he too suffered from the issue. I have contacted apple support and they said I can take it to my local apple store and they will exchange it.