You don't get an unsubscribe until all clients subscribing to that item have disconnected, similarly you only get one subscribe per item no matter how many clients subscribe to the item.

If you only have one client then I guess you should have received an unsubscribe - this is what I observer. Of course it might take a little while for the server to determine the client session has gone away vs. temporarily disconnected. I know if I've seen any description of that part of the protocol (session expiration).

I expect you'll see a response from the Lightstreamer guys here soon...