nifi with openshift: pod restarting intermittently

[#1]

I have nifi running in openshift, and observe that after some time of operation a dialog box pops up on nifi UI, containing following message, and pod restarts.

Application is not available The application is currently not serving requests at this endpoint. It may not have been started or is still starting.

Possible reasons you are seeing this page: The host doesn't exist. Make sure the hostname was typed correctly and that a route matching this hostname exists.

The host exists, but doesn't have a matching path. Check if the URL path was typed correctly and that the route was created using the desired path.

Route and path matches, but all pods are down. Make sure that the resources exposed by this route (pods, services, deployment configs, etc) have at least one pod running.

nifi logs dont show anything related to it though.

What can be the possible issue here?