Restarts at random during navigation

BasMeijneke Registered Users Posts: 1
Apprentice Seeker
My one month old 550 restarts at random during navigation.
Sometimes it resolves the route, most of the times it loses contact with the route.
Then cancelling the route and restarting it is necessary.
It happens at smooth and bumpy road surfaces, it happens at low and high speeds.
It is annoying and dangerous!

Another complaint is the screen orientation.
It changes from landscape to portrait at random, mostly when driving on smooth and straight road surfaces without any acceleration or deceleration.

What can I do to resolve these problems?