Chat ends quickly

I am trying to get a chat started. I get as far as they say 'Joe Blogs" is ready to chat and then it goes straight away to chat ended. It has happened a couple of times just now. I do I prevent this from happening please?

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Note: when you’re in Chat dialog & want to connect with a human agent & see Type your message here… => type “Live Agent” until you see We are connecting you with a human agent…

~ for example: