My phone is flashing after I transferred some games from my cousin.

Hi.I have a problem. My phone is flashing at low brightness. I think it started after I transferred some games via share it from my cousin's phone. Her phone is completely flashing now. Mine is a bit. But she said that her phone started like mine too. How can I fix it ? Please help me!
By the way my phone is Samsung j2 2016. Her phone is j1 6....

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