Bought a P320RX. The romeo 1 didn't always turn on when I picked it up. Sig replace it. At first I thought the new one also had a problem. It would not always go to sleep and turn off the red dot. I read a post saying the Romeo 1 was so sensitive that an incandescent light would give off enough vibrations to keep it from turning off. My gun was on a dresser with a digital clock on it. I moved the clock and the problem went away to my great relief.