Problems with my Nav
 

Has anyone experienced this with their nav:

Works initially when I turn on the vehicle.
About 5-10 minutes later, it seems to need to "reboot" and the screen says: "initializing", then it counts up from 1-89%, then gives me a message of: "Navigation not installed", then for the remainder of my drive, the nav is non-functional....until I turn the ignition off and restart the car.....then it does the same thing again!!!

Any help (to avoid a trip to the dealer) would be greatly appreciated.

Are you sure you don't have a MMI button "stuck" in the down position...

Did you install a new nav disk?

No, I didn't even touch the nav computer housing. It just started malfunctioning on it's own.