Why my phone flashing white when unlocking after play HD games

[Android Central Question]

Hello,
I have Asus Zenfone 3 Deluxe ZS570KL
Few weeks ago i updated to Oreo 8.0.0. Few days after update it's still ok, but after that whenever i played some HD/3D games, when I unlock use fingerprint, restart or shutdown, it start flashing white light.
But if i play non HD games it didn't happen.
It's randomly happen.
I already try wipe cache, factory reset and disable HW overlays.

Anyone can help me please, is this happen because oreo or my hardware?

Thanks