Recently my tv has started to flicker. It was difficult to notice at first but has progressively gotten worse. My wife and I started to notice that the reds and oranges looked different (looked very pixelated). Then we started to hear loud noises coming from the back of the tv (especially when we turned the tv off). The noises lasted approximately the same time as the lamp cool down cycle. Now our tv violently flickers after about 15-20 minutes. We replaced the lamp in Feb. It is now Nov. Does anybody have an idea to what the problem is?