maybe i dont know GSX relating with CTD,but i could find out from event viewer an application error.
The Event Viewer itself is giving you some evidence the crash is NOT caused by GSX, just look at the timestamps of the events:
Flight Simulator.exe crashed at 22:18:38
Couatl64_msfs.exe crashed at 22:18:41
This proves without any doubt that Flightsimulator.exe crashed for another reason, and it MADE Couatl crash 3 minutes later, because the crash in the sim prevented Couatl to receive the normal Simconnect "Quit" command it would receive when the simulator stops normally, so it couldn't get a chance to do its own memory clean up.