I have a GE Time Switch that I am having issues with. For the past few years it has been making a loud buzzing noise when on the "Timer" setting and the timer actually "on" (didn't make any noise when switch was "ON".. This year the electric is on when on all three settings ("On", "Off", "Timer") and it doesn't matter if the timer dial is in on or off. Also, it is still making the buzzing when the timer dial is "on" but no buzzing otherwise. Any ideas what could be wrong?