CB doesn't time bomb. It's not going to sometimes work and sometimes not work. Bugs tend to be extremely consistent as they're generally due to a PHP error. Server errors are inconsistent as they're typically related to memory, timeout, etc... Especially those related to connection. However, that's a browser error related to connection.
Clear your browser cookies and cache then see if issue persists. Beyond that I don't know what to tell you. See the below search for more details and ideas.
www.google.com/search?q=joomla+ERR_EMPTY_RESPONSE