Tomtom GO Professional 620 .when driving the screen will go dark
But...when I'm driving the screen will go dark ( as I drive along at night, the screen doesn't turn off as it a faint dark). After about 5 seconds it starts to run the map and route. But it keeps doing it. I've done both soft and hard reset. On other occasions it just shuts down and reboots by its self.
This is very annoying as I drive in built up areas and have to navigate frequently.
Can anyone help. Please