Mine does this near the end of matches, first at Area 5 and now yesterday at the WI Sectional Championships. I'm noticing that by the end of matches (USPSA Carry Optics Division), the dot won't come on. As you know, normally you just have to pick up the gun and/or give it a shake, and the dot is there. At Area 5, I just replaced the battery thinking it was time. Then yesterday it did at the start of each of my last three stages, with a new battery.
I end up having to press (and even hold down) the power button several times, and then go through the cycle to get to the brightness setting I want - like it was reset. This morning... it was back to normal. The unit is only about 4-5 months old.
