The MMI screen on our 2005 A8 is making a noise that sounds like gears aren't aligned when it goes up or down. I have to physically help it up with a push. More often than not it lowers without me having to do so, but I sometime have to push it when it nears the bottom. I know that replacement MMRI screens are very expensive. Other than this issue, the screen works perfectly. Any advice will be appreciated.