Screen Flickers Until It Won't Wake Up

HI guys, my S5 G900H has this weird problem, when I press the power button to turn the screen off or when is about to turn off automatically the screen flickers before it goes off, and then it's really hard to wake it up, I mean I have to press the power button at least 10 times before the phone wakes up, any idea on how to fix my issue.

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