mirror problems 503 reply?

All, I don't know if this is a know problem or if I'm just lucky, but checking the mirror status from the archlinux.org main page show more than 50% of the mirrors without any sync status. Trying an update, I just got a 503 reply for an http mirror. Changed to one showing it was syncing -- no issue. Do we have mirror problems? -- David C. Rankin, J.D.,P.E.