I was wondering if anyone else has been having issues with the Maps application on the iPhone 4. When I setup a route somewhere, as I am driving along following the map, the route will just disappear randomly. I have to go and recalculate it again for it to come back. It's bizarre, because when I first calculate the route, it shows the whole thing, from start to destination filled in. Once I start to follow it though, somewhere along the line it just cuts out. Anyone else experiencing a similar issue? I have tried restoring to no avail. Thanks!