Took the X in a week ago to g t a few things fixed lost delivery, since I picked it back up the sat nav hasn't really worked... it kind of works but thinks I'm 20km or so away from where I am actually at the time. I tried resetting the screen and still no dice... anyone else have the same problem? I'm wondering whether they can fix it over the air or whether I need to go back in and get them to fix. Thanks!!