my 7yr old Bullfrog is tripping again. About 2wks ago we were in the tub for about 2hrs and the gfi tripped. Although we replace the GFI last year, I figured that was the easiest fix. When it happened again after using it for about the same time I decided to replace the heating element (which I replaced 2yrs ago). The tub runs fine, standard mode. But last night, after 2hrs of use, my tub is trippen again! I don't know where to go from here, without spending a butt-load of cash calling "the man". FYI: I also replaced the pump 1.5 yrs ago. HELP PLEASE!?