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I am having a problem with my PMDG 777 after flying it for a while. In particular, after flying over FlyTampa's Kai Tak scenery/Imaginesim VHHH, as well, my 777 goes into this skeleton mode where I see the interior but missing the textures of the plane as seen in the attached photo. Whenever I return to the cockpit it is all gray for a few seconds (sometimes longer). It has crashed once but it did not give me an out of memory didn't give me any error actually. I have my settings at a fairly reasonable level considering my system (nothing maxed out but close). I am running an i7-5600k OC 4.6Ghz 16GB RAM GTX 1070. Also worth noting, I have the HIGHMEMFIX=1 in my cfg. Any ideas what could be causing this and how to stop it?

Thank you!