Phone clicks the screen on its own randomly

My phone clicks the screen on its own randomly that I am unable to press any other button.
Because it touches the screen so fast, even the power button is not working that well at the moment.

I tried turning it off, turn it back on, and reboot but it still does not work.

I have unscrewed the back and removed the battery on my own, so I cannot even get any factory warranty.

Any help would be much appreciated.

Thank you!