08-15-2011, 9:10 AM
I've got a K-15 and it will dim, blink, or go off completely sometimes. The weird part is that turning the battery cover will bring it back to full brightness, and even weirder: It usually doesn't matter which way I turn it; it will help even if I'm loosening it! It seems to be exacerbated by using the tape switch, but I assume only because I'm turning it on an off more frequently. Shock doesn't seem to make it blink, though. I can give it a good whack with no problem, and it won't change the brightness or make it blink..