Can you try a mtr to your app domain and, if you can still reach the app, can you try curl -v -H 'flyio-debug: doit' https://your_app_domain and share the results?
Can you try a mtr to your app domain and, if you can still reach the app, can you try curl -v -H 'flyio-debug: doit' https://your_app_domain and share the results?