We replaced the heating elements in the hot water heater recently. Since then, after using hot water, there is a very loud noise that sounds like a hair dryer turned on and laying on the counter. If you turn on hot or cold water, the deep loud humming subsides, but eventually the sound comes back in a few minutes. After 5-10 minutes, the sound goes away until the hot water is used again. The hot water would have to be used significantly like shower or washing machine, not just washing your hands. Could this be related to draining the hot water heater? How can this be corrected?