I just noticed that my faucet outside doesn't work right. When I turn the faucet on, I get water leaking BEHIND the faucet outlet when connected to a hose or cover the end of the faucet with my hand. When there is nothing restricting flow, the water leaves the end of the spigot just fine. When the faucet is turned off, there is no leaking. What should I do? Can anyone give me any advice, please?