[Q] Screen brightness flickering whilst watching video?

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http://forum.xda-developers.com – I have noticed that when I am watching videos on my Galaxy note 2 N7100 that the screen brightness will jump from whatever it is set at to a higher brightness and jump back immediately after. Its like its flickering between brightnesses even when auto brightness is off and set to full and smart stay is off, it manages to jump up and down and is quite annoying whilst enjoying a video. It happens regularly (every 2 mins for 10-15 seconds). Any clues to what is causing it and a possible fix. I am running stock XXALIH Thanks (HowTos)