Took my new BG38 to the range last week. After about 10 rounds, the laser switched off. I turned it back on, and it switched off after 1 round, then back on by itself, then off after one round, then on, then off for good. One battery is 1.5v, the other 3.8-4.0v. Will a low battery cause the laser to grow dimmer, just switch off completely, or work intermittently? After testing the batteries, the laser now shines brightly. What's my next best step: replace batteries or ?