In these situations, it is important that auto route recalculation is disabled, because i have seen when driving in a crowded city with tall buildings and very near street that the gps icon may falsely switch to the neiborghood street for a short moment (going off route) when there are tall buildings and gps signal is weak, this would trigger route auto recalculation if the option is on. I am driving with this option always off anyway and press F3 key to recalculate a route when really needed...