This error is usually caused by the web server limitation to stop working after 29 UNIX CPU load. Such errors should be very rare and we are taking all measures to ensure the server's load does not go beyond performance critical levels.
However, if this error continues to show frequently on your pages, it might also indicate a problem with your account. Please log in your Customer Area and check if there are any active tickets or server notices for your account in your Help Desk. If there are no such tickets or notices, you should open a new ticket from the Website Issue category.