So sorry for late reply…
- Nope. No random shut down on mine.
- No flickering either except when battery is really low in juice. That’s when the low frequency PWM kicks-in… very annoying…
- Yes, I did experienced it but only on the 400 lumens version that it does not respond to the ON click in rare occasion, I can’t reliably simulate it. It happens very intermittently…
- No issues with the Panasonic batteries, I’ve exhaust 5 sets of them in the 300 lumens version and 3 sets in the 400 lumens.
- The tailcap does grind the negative side of the batteries, but it doesn’t “cut” them. This is the main reason I don’t use NiMH rechargeable in these lights.