This only happens while I am running water. I can hear the pressure switch clicking on and off the whole time I am doing dishes, laundry, ... Since it is only when the water is running I believe that means it is not a leak. I changed the check valve and that did not fix the problem. I checked the pressure in the tank and it seemed to be around the 20/40 mark. Any other ideas anyone?Thanks.
It sounds like the bladder in your pressure tank has ruptured.