Grafana - Defects in 5.3 version

Need some suggestion to overcome below defects which we are facing with the framework ->
Talend -> Influxdb, Grafana 5.3 , LDAP (AD) & NGINX Load Balancer.

  1. Getting Unauthorized error while accessing the dashboard features after 4min of login without being idle

  2. Able to Login without entering credentials by clicking back button after logout.

  3. Not getting logged out after defined timeout of 5 min