Hello, I'm trying to isolate my problem with the PMDG 747-400 and 747-8. Each time when I am flying the same flight plan form KJFK to EDDF my screen freezes. I do not receive any error message and I also here sound. When the pc locks up, I wait for serveral minutes before I do a hard reset. I'm assuming it's the PMDG aircraft thats causing my screen to freeze because when I use the LEVEL D 767 with the exact flight plan I don't have any lockups. When Flying I'm using the REX weather engine and I also set the simualtion rate at 8x over the ocean and return to normal when reaching main land. This issue has been annoying me for some time now so any help would be much appreciated.My system spec. EVGA GTX285, i7 920 overclocked to 3.8ghz, Muskin DDR3 1600 6-7-6-18, and ASUS P6T Deluxe v2. For testing purposes I also had set the cpu clock speed to stock 2.67ghz.Regards,Karl