Invalid session, please login

Hello everybody, After the deployment of our app in production environment, sometimes the client face a problem when trying to log-in, when he type the credentials and login, the page reload without accessing to the app, only after the 4/5 tries the use is able to access. We tried to debug, and we got this error: mendix.sys.Server: loadHandler: server error: "{\"result\":\"Invalid session, please login\"}" {message: "Unable to load status: 401", response: {…}, status: 401, responseText: "{"result":"Invalid session, please login"}", xhr: XMLHttpRequest, …} anybody knows a solution for this?
1 answers

Inform you users before a release and request them that you will release a version and that they log off?