I've been having a similar problem with my Strion LED. It's been happening more now that it's cold, but I don't know if the problem can be contributed to the cold. Tonight for instance, I was on wall patrol, and half of the time the light wouldn't turn on. Sometimes a few smacks would do the trick, but other times I'd just have to put it back in it's holster, and a few minutes later it would work like nothing happened. Then when I got inside, I was playing with it to see if I could figure out what was wrong, and it turned on, but wouldn't turn off until after about five minutes of playing. I also can't seem to get the cap off, and the problems seem to get better or worsen if I play with it. Thoughts?