It flickers in such a way that it seems as if I had the down button pressed or stuck, but that is not the case.

If I click on the grayed top part of the scrollbar to scroll it up by increments, it just flickers instead of actually going up. The same happens if I open a browser, Chrome in my case, the scrollbar goes straight to the bottom of any site I visit, as if I had the 'fn+home' buttons pressed down. As soon as the OS finished booting up, I open the Documents folder, or any folder with enough files to have a scrollbar, and the scrollbar just goes straight to the bottom. The issue is that whenever I turn on my laptop (either from powered off or from sleep mode), as soon as it boots it just starts scrolling down by itself. This issue started out suddenly and completely out of nowhere, and it occurs even in safe mode.