Hi All and happy new year. I got fed up in the end and rewrote the webservice into the latest .net 8 Web API. This meant that the quick start docs on the couchbase documentation site made a lot more sense. I also changed everything over to async at the time and am pleased to say the error has gone and everything is running much smoother.
Previously the service was wcf and where everything was running synchronous I believe the potentially 100’s calls a second were beginning to queue and cause a timeout. Thank you all for your help on this matter.