The problem is not GSX is failing at destination, which is usually caused by Simconnect being overloaded by too many commands or too many objects.
The problem is you say you cannot restart Couatl, which is not normal, since it has been designed to be restarted at any time. Please provide more information about your failure to restart.
I'm assuming you are restarting it from the Tray bar since, of course, if the normal menu doesn't load, you cannot use it to restart, that's the reason why there's a Tray bar area icon to begin with.