Hi, I'm new here but have been a lurker for quite some time. Anyway, when I first got my 8500 X50 I kept getting "self cal" and then "service required" messages. I finally noticed that it only happened when I had my electric rear sunshade up. I guess it was confusing the rear radar sensor. I obviously don't drive around with it up any more, but has anyone else had this problem when there was an obstruction to your radar? Thanks.