My 5years old TomTom VIA 135 shows the following problem: It takes between some seconds and some minutes and the card (with or without route) disappears and I am asked for settings. Whether announcements should be made, etc. I make the settings, finish the settings: a short time later the same question appears. I leave the settings: a short time later the same problem. I can practically no longer use the navigation system or I keep pressing "Exit menu" Help!