Sat Nav freezes after powers on

[p6raf]

Help!!
All of a sudden my Discover Media system no longer tracks my position.
When I first switched on it finds my location fine but then never moves.
Tried holding down the power button for 10 seconds and resetting the unit but it doesn't solve the problem.

 

[roadtripper]

Have you had any work done on the door mirrors, the problem might be an issue with the GPS antenna.

Does it find a new location if you park up somewhere else or is it just stuck on the last single location it had no matter what?