[mike31154]

Good idea. I've also found the odd time a piece of equipment I unplug and then plug back in will cause the GFI to trip. One was a fluorescent ballast on a digital timer power bar and also the Rena canister filter on occasion. I'm no longer using the fluorescent ballast since I couldn't trust that it would not trip the device on every time cycle (I also decommissioned that part of my lighting since I added 2x MH). A second fluorescent of the same brand on another digital power bar of the same brand work flawlessly, go figure. Could be the digital power bar was causing it too, I didn't try to isolate the glitch any further. It's a tradeoff you need to be aware of and live with when using GFIs.