So my X-Plane 10 runs real smooth for the most part then after a while of flying, there are more sudden freezes and then all of a sudden, the frame rate drops to almost zero or so.  Super slow response, almost unflyable.  Then I just have to quit the flight because nothing I do will reset it to normal flying.  It's as if the computer just can't process it anymore but ran smooth from take off.   My specs: i7-4770K GTX 760 4G 18 GB RAM 750 watt PWU ASUS Maximus Hero IV mb.