I have a new 24 MSLR, two weeks old. This morning my map went away. I can still see my location arrow, but it's on a black screen. Earlier I could see the local superchargers, but those are gone now too. I can navigate, but there is no map overlay. All other connectivity is fine, so that's not the issue. Been googling all day and I can't figure out what might be causing this. Is this a known problem?