You know those movies in which people are using cheap flashlights that are flickering on and off for no reason, and they keep tapping them to get them back on? Well guess what is happening with my relatively new Maglight? I unscrewed the head to see if it was stuck or something, it seems to spring in and out OK, batteries are new, etc. Everything looks OK inside. But if I touch the bulb or plastic base with my fingernail, just barely, it will go on and off. Usually it just flickers when I try to use it, but sometimes it doesn't come on at all. Yay for Mag Instrument.