Yeah, I'm having trouble with my Fenix. To be precise, I dropped it in about 14 inches of blown-in fiberglass insulation somewhere in the 30 feet between the attic access and the far corner of the attic where I had gone truss-hoping to look at a plumbing vent. Didn't even realize it 'till I got back down the ladder, and when I went back up to look... could... not... find... flashlight - it had vanished without a trace. Moral of the story, I guess, is just leave it on the whole time I'm in the attic, even on the medium-low setting (which is where I leave of most the time in attics) I could probably have spotted it once he attic light was off. Gotta' say, though, I loved that light, enough anyway to have ordered another overnight shipping.