I have only had my bliss out for one day for about a half hour. I have been testing it in the house with different relics, and rusty things. I put it in the closet, and when I got it out a couple days later to test some more items, it would not even detect a large box full of coins at 6". I contacted Ray at blisstoolusa, and they sent me a return authorization. I hope it is nothing more than resetting it. I hope the bliss is not that sensitive to need resetting a lot.