Vertical glitched grey with snow screen on Android GalaxySu

Why is my screen on my android Galaxy S7 vertically split into two and one half is "grey with snow"? This just happened after it fully charged and I found it in such way on the charger. The keys and screen reacts to touch under the "greyed snow" if you know where to push. Very puzzling. Already tried a reboot...didnt work. Anyone out there that can help?

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