Problem Client App Android - Reports Server Maintenance

For a few days now, after connecting to the server, the app correctly reports that the server is in maintenance mode and does not display files and folders… however, the server works fine from the browser and is not in maintenance mode! …so it’s a problem with the app! …maybe you introduced a bug in the latest app update? … how do I solve the problem? … I’ve already tried uninstalling and reinstalling the app several times without being able to solve the problem!