The installer has placed an Icon on your Desktop named "Start Couatl for GSX MSFS", which is used to start the program after the sim started for any reason, either if hasn't started automatically, but also it it crashed during flight.
Since we haven't been able to reproduce that crash in flight, it would be helpful if you added some details about your configuration like:
- the airplane you are using
- if you enabled the SU10 Navdata API option in GSX
- all the other add-ons you are using, especially those that will use Simconnect to connect to the sim, like AI traffic injection, FSUIPC, etc.
- the route for that flight.