lexus RX300 54 2005 Dose your sat nav show all the street names as you pass?

On starting the car one morning after 11 months of ownership, the sat nav only showed a limited map view, with only the street name that I was traveling on at the base of the sceen,it used to show all names of the side roads as you approached them.Lexus said the sat nav was working fine and this model dose not show that kind of map ,we know it did.has anyone got this model and year,what dose yours show.help!