I have just taken my new Go Discover 7 on it its first drive and it was unusable. Set it up last night, connected phone, connected WiFi. Put it on the mount today and selected where I was going from My Places. Hung at the menu selection and would go past that. Restart device. Eventually get to point where it is good to start driving. After about 50 metres everything freezes. Restart device. Get going again and map freezes but GPS and directions continue but no movement of arrow on map. After a couple of minutes screen goes black comes back alive after 30 seconds, continues for a minute or two and freezes. Gave up on it until return trip and went through the above and more. As I said unusable. Any suggestions?