What is with the disappearing articles?

Refresh the page. See an interesting new article, and before you can click on it, it disappears. Refresh again and again and again, and each time the new article disappears before you can click on it.

OR, see an article in the feed, click on it with no problems. Provide a comment on the article. Go back to the main page, look for the article you just commented on, and the article has DISAPPEARED completely, not to be seen again for hours unless you access it through the reply/recommend notifications.

Can you guys please fix this??? It's been going on for months now. Or is there something wrong with my setup? If so, please let me know how to fix it.