Scenery not totally loading

Hi All,
I wanted to repost this with the hopes of resolving the issue. Sometimes when I load KPHL the airport does not totally load. Building are missing, walls are missing but the roof is there. Sometimes I have to back out of the sim and reload it from the Xbox menu. It may take 2 or three times to load correctly. Any ideas would be very helpful. Does anyone else have this problem?

Thanks,
Jim