Admin UI seems only unresponsive if server is down

Steps to reproduce:
1. Start matterhorn, use the new admin ui
2. shutdown the server, but keep the browser open on the new admin ui.
3. you can click on links etc, but you do not perform an action. You don't get an error (404) something similar. So it might look like a slow network or something like this. As the problem is not noticeable on first sight.