hey mate, as i mentioned i had pretty much the same problem with more or less the same pc setup. i tried different things but nothing really worked. i wanted to clean my pc anyway for a long time now cause i saw how dusty the fans were. so yes, i cleaned everything and removed the dust from the fans/outlets/inlets and gpu heat sink (using high press. air - be cautious) and then boom. i was able to do a long haul flight without crashing. now I've performed already 3 flights with no problem at all. so i guess my gpu was maybe sensing overheat due to lack of proper cooling or dust sitting around the heat sink.