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I don't know if this is normal, nor if I could actually explain what's happening, but sometimes the screen dims & somewhts starts get brighter a bit & dimmer so fast
is it normal or shal i return it ?
If you r using ICC
Settings->Developer options->Show Screen Updates
this option couses flash effect for updating area that may be your problem if I understand right.
that's the ambient light sensor, it's normal
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unrelated topic, if you have some time please check this thread
Yup it was the ambient light sensor, I exchanged it for another 1