Congrats on the new x5. I once had the nav take traffic detours and after a couple of crazy detours I turned off the feature and found out that the locations it thought were congested were actually clear. I don't know if there is a default setting for that. Perhaps it is trying to avoid imaginary traffic congestions in your case?? The other thing I can think of is perhaps the map does not have all the roads in your area. Can you see the routes it is not following when guidance is off?