SharePoint 2013 uses a Distributed Cache Service to cache login tokens. In SharePoint 2010 Products, the login token is stored in the memory of each web front-end server. Each time a user accesses a specific web front-end server, it needs to authenticate. If you use network load balancers in front of your web front-ends, users need to authenticate for each web front-end server that is accessed behind the load balancer, causing possible multiple re-authentications.
The Distributed Cache depends on Windows Server AppFabric and old versions of it had lot of issues and is known to cause login prompts while editing SharePoint Pages. Follow the below steps to upgrade to latest version and login prompt issues will be resolved. You may have to restart the computer after you apply this cumulative update package.
- Go to http://support.microsoft.com/kb/2800726
- Download the latest cumulative update
- Copy it to the server and update app fabric