If something can be fixed by restarting the Couatl engine, it means we can probably fix it so it's worth investigating on our side.
If something (especially after a flight) is not fixed by restarting the Couatl engine, it means the simulator itself has an issue, most likely Simconnect stopped calling us back, which sometimes happens if MSFS is running from quite some time and/or because of bad Navdata along the route and/or because the maximum Simobject limit has been reached along the flight. In these situations, the only resort is to restart the sim.