crwdns2894164:0crwdne2894164:0
crwdns2894186:0crwdne2894186:0

crwdns2893792:0crwdne2893792:0 hamed ,

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screen's flashing when turn off screen

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When  I turn off the phone's screen, the page starts flashing shortly, what to do with this problem?

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Samsung Galaxy J7

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open