Before starting with troubleshooting steps check the following articles and prerequisites regarding this topic:
a. https://technet.microsoft.com/en-us/library/jj219572.aspx Plan for feeds and the Distributed Cache service in SharePoint Server 2013
o One of the most important things to remember – DO NOT use dynamic memory on the SharePoint 2013 servers
The Distributed Cache service can run on either a physical or virtual server. When using virtualization, do not use Dynamic Memory to manage shared memory resources among other virtual machines and the Distributed Cache servers. The memory allocation for virtualized Distributed Cache servers must be fixed.