dont turning on my screen - Galaxy Note 4 Q&A, Help & Troubleshooting

i have a galaxy note 4 , n910h
and i have a problem
some time ,my lights screen phone dont trun on when i unlock my device , while other function of my phone works good in that moment( for example , ringing ,and even touching and .... )
in other time , all function is active and works good .
whats the problem ?

plz help me

It could be a hardware issue. I'd take it to a Samsung Service Center and let them take a look at it.

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