Premium chatissue

Is there a way to know if the chat has been disconnected from customers end coz it has happened to me that I have been asking the customer constantly for a response and the same persons chat pops up on the fixya utility. I just got lucky once to catch up with the customer. usually the chat gets taken up. I already hadissues with chat for either the customer wasn't able to see my response or the otherway round now I have reinstalled the windows and have changed the browser to Mozilla Firefox now I keep asking the cust on the chat and don't get a response and see the same persons chat popping up for the issue.