Any electrical trouble shooters out there? I've got a 8 x 54 T5 retro lighting fixture that I'm just setting up. It has 2 switches/power cords and each one works fine individually. However, when I turn them both on together, it trips the GFI. They were working a few months ago when I first got it, but now that I have attached it to the canopy, the problem has developed. I figured that it was a loose wiring connection, but have checked all the connections and wrapped the wire nuts with electrical tape. Any suggestions?