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Why does the screen of LG G4C go black when in a call?

When i make a call on my lg g4c the screen goes blank until the call ends. if i want to end the call early i cant touch the screen as it doesnt cone on until the call has ended?




My partner had a similar problem. She got a new replacement phone, replaced the cheap glass screen protector and the fault returned after 24 hours!
I removed the cheap screen protector and all is perfect again.
Would be interested to know if you have a screen protector and if removing it also fixed your problem?



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