Single, rare screen flicker

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http://forums.androidcentral.com – Every once in a while, my Maxx flickers. It's just a quick flick, a small fraction of a second. And it may happen once a day, but it's weird. I broke my last HD and got a new one. It does the same thing. Anyone else notice that? It doesn't seem to hurt anything and having it on two devices makes me suspect software. (HowTos)