Hi,
just received an issue today. Loading MSFS2020 with PMDG777 at Aerosoft EDDF. GSX window appears but doesn't load content, than Couatl quits and wanted to be restarted only to be quit again and again. It looks like simbrief connection was corrupted as I was seeing a simbrief loading bar appearing in the GSX window. Finally GSX quit. The only change I made between the last session and today was to install WIN11 updates (some 10) before starting MSFS. Before that it works perfectly fine.
BR
Andreas Hövel