Was great when I first bought it but now loses GPS signal

I thought theyd never update for iPhone 5 but finally its here. I like all the new features like foursquare, blocks showing where the traffic delays are. Not sure what others are talking about but Ive had no crashes or freezes. Maybe its a 4s issue.

Ignazio216 about Magellan RoadMate North America, v2.6.1