I've owned my energizer hard case pro TUF2AAp for 6 months. It has never been dropped or abused. Recently the light is intermittent, when the batteries were replaced it required tapping it gently to one side for it to light up and work for awhile. I think there is a loose connection inside?
Camping, Backpacking & Hiking - Energizer - TUF2AAPE Hard Case Pro Flashlight