I recently bought a Dell laptop for my placement purposes.

It was hanging a lot just within a few days of purchase. Then I got a replacement. But unfortunately the new laptop is also hanging. I don't even know how to explain this properly, but the cursor is moving on it's own while I am studying and watching yt videos. The video is pausing and playing on it's own and even changing to full screen and exiting full screen without me even touching the touch pad. Not just this but text is getting highlighted on it's own and for several times. The worst part is the cursor moving violently on its own and hanging during online exams. Please help me fix this. I can't even ask for another replacement. I just don't know what to do about this right now. I took videos but there was no option to attach them but as you can see text highlighted on it's own below. Please let me know what's happening and how to fix it as it's scary and frustrating at the same time.