My pages or articles disappear after a while.
Pages and articles have to be published to be shown on your website. You most likely did not publish the elements that seem to spontaneously disappear after a while--you were only able to see them because you were logged into the back end. While you are logged in to the back end, unpublished and hidden elements are visible (extended front end preview).
Last update on 29.04.2015 by Leo Feyer.