Error: write ECONNRESET

I am running a SOAP request calling a published working service. It worked on the first attempt. Since then the very same request fails with a Error: write ECONNRESET error. I know the service is up and running ok. Anyone got any idea what this error could be? The same thing happened when I used SOAP UI - it worked and then I got a Connection rest by peer: socket write error. I have tried numerous things to get round this error - resetting the sockets, swapping from wifi to ethernet. Periodically the request works but then I get the same error.
Any one else every experienced this? Other people in my team can are not having issues calling the service.