Sun visor on driver's side is not working properly. it will not stay in any position i set it to. it hangs down. it is a safety hazard because it blocks my ability to see long distances. i checked on the replacement cost & it's around $400! we buy high end vehicles because we don't expect this sort of problem within 3 years of purchase. it happened when i turned it down to block the sun. i heard a loud squeak & it will no longer hold the positions it should. it is dangerous. is this a problem others are experiencing?