My phone is buggy.

Hi. I have an Samsung Galaxy S6. I have it for ~10 months and like 1 week ago started to do weird things. When i scroll down it appears an square with different lines on the screen and keeps scrolling the lines on the square not on the display. When I type the keyboard is buggy and start's moving upper and I almost cannot type. This happens when I use the phone for longer than 1 hour. I tried to restart,to wipe the cache and all stuff,to factory reset,and nothing worked so far. Please help me!

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