I recentlly purchased two of the photon 3's. One has so far worked perfectly, but the other one did the same thing. The different modes quit working, then it got to the point that it wouldn't shut off. You had to take the batteries out to shut it off, but it didn't change anything. Turn it back on and wouldn't shut off again.<br>I havent tried talking to L.R.I yet, but they have a lifetime warrenty on them.