Found out the real reason for the screen flickering ..it was a nearly unseeable hairline crack on my screen that had to be replaced
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When you do the fingerprint its better to swipe down with your finger then then do a sideways swipe with same finger that way it detects your whole finger so it works straight away instead of swiping 5 times or more to unlock phone
Re: Samsung galaxy note 10.1 2014 edition screen flickering/blinking.
Happened to me too realy bad flickering on my screen download Clean Master App ...it worked for me
Thanks i usualy use apple products but giving the note 4 a go so far i love the phone except for the faulty screen just downloaded an app called Clean Master seems like its done the trick so far