We think my brother's X-70 needs some help and it's only about 3 weeks old. Will air test a quarter at 3" max.!!! Penny on the ground hardly makes a blip sound. Quarter a little more than 3" down, forget it, not even a beep. Tried all settings, 3 different coils, new batteries and all connections solid. Worked fine at first then something happened along the way. Hope it doesn't take forever to get fixed.