I have a gfi plug in my bathroom and I can't get the test button to work. A gfci tester says correct wiring but the test button does nothing. It acts like it is stuck or something. There is another plug in the bathroom that is on the load side of the gfci and when I hold in the reset button on the gfi, both the gfi and the plug shut off until the button is released. Is the gfi itself bad or is there something else?