Well, it happened this morning at 2 yrs and 6 months and 14,000 miles. I had the Z in to install the column lock bypass. I've been watching the problems detailed on the Forum about the OEM battery and the Optima Red Tops. I have also paid close attention to the charging system. Always charging 13. to 14.1 on DIC. Started up this morning no problem. Drove to Firestone and shut off. No problem. The manager, my buddy, moved his truck and said I should park it in his spot. Started up no problem. The only tech permitted to touch the Z starts it up no problem. He backs out and shifts to 1st - car shuts off and the DIC is flashing Security. No warning at all. Just busted. I was going to wait until fall, but I'm just lucky I was in the Firestone parking lot and not 100 miles from nowhere in eastern Montana. I even went home to get the second set of keys after reading the Manual. However, nothing wrong but the battery. All this on a car that is driven year round. If it sits longer than a week in the winter, I put a battery tender on it. I think I did all the right stuff and kept an eye out for trouble, but it happened anyway. If your OEM battery is more than 2 and a half years old, get a new one. Don't wait because yours could also go without warning.