The past hour, I am triggering this quite often. Ranges from opening a thread, replying to a thread, adding tags to threads, refreshing the forum/all.html, forum/unanswered.html pages, or the followed tags timeline page.
Code:
Service Unavailable - Zero size object
The server is temporarily unable to service your request. Please try again later.
Reference #15.a75b434d.1370190306.bba660a