I have exactly the same problem with my Magellan with 4.02 version, I had installed the 4.06 version on my magellan and i have more problems with sat reception, i have to waste more time waiting for establish the sat's signal.
I call to Magellan support of my country and they suggest me to reinstall the 4.02 version, it's work better but i have your problem too.
I reported this problems to Magellan ant they don't reply my email.