My 2020 A4 with 800 miles just developed a rattle that seems to emanate from the MMI screen over rough pavement. I can also reproduce by tapping the dash with my first right next to the screen. It sounds like there's a loose coin inside. If I hold the screen with my other hand while tapping the noise does not happen. Has anyone experienced this and were they able to DIY a fix? I'd hate to make a dealer trip just for this but it will drive me bonkers. Thx in advance.