Hello, I'm having an issue with my Dell 3520 display. At seemingly random points the screen will glitch with pixelated lines all across as well as flash to where I can barely make it out. It only happens when I move the track pad. And the only way to stop it is to minimize all windows, place the mouse icon where it is not on top of anything and wait about 10 seconds. It then goes back to normal for anywhere from 30 seconds to 10 minutes . Any ideas what could be causing this?