Openshift 3.11 + 503 response - openshift

I have setup my web application and I saw my POD was successfully deployed, I have created HTTPS and HTTP route of the service. But when I hit the API, it gives sometime success or sometime 503 status code.
I do not see any issue in the POD and also I have setup health check.
Could anyone help me to resolve this issue.
POD Image :- jboss-webserver31-tomcat8-openshift:1.2
FYI- Right now I am using free version of the OpenShift.
Thanks,
Shailendra Soni

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enter image description here
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enter image description here
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