Behind the wall where the hose connection is, there is a one way flow restrictor valve on the Classics. That valve is probably stuck. You can reach your hand behind the wall and disconnect it. Might be able to free it up using silicone spray, be sure to wash it in hot water before replacing, if not replace the valve. If, that valve is stuck I would have a replacement on hand even if you are able to get it unstuck. It will probably be a temporary fix.
It is normal to say bad words getting to the valve blind.