Status code extraction error - NOHttpresponse exception

I am trying to process large file of request using our REST API which usually works OK using ready API. However for this particular model I am sending 200 entities in a request and I am getting status extraction error and Nohttpresponseexception.

If I reduce entities to 13, then the request works fine. Is that a issue with memory? if so what do I need to do in readyAPI to address the issue?