When opening a Map in Fieldmaps the app checks if all services respond to the initial request. Services that don't respond are shown with an Exclamation mark.
But if the service goes down during the use of the app there is no signaling to the end-user. Even though the service gives an HTML file output notifying the service is in error. The app expects a png output so no features are drawn.
Please notify the end-user Services do not respond as expected, just like at initial opening.
Now users see dangerous area's on the map. Walk for a minute look again and no dangerous area's are visible so the user thinks he's save.