OK, I've not seen this turbo mode, where is it? But as far as it being a heat issue I can turn it on for less than a minute and shut the car off and it will still stay on for the almost the same amount of time as if I just got back from an hour drive. I would think if it was heat it would last longer if it was hotter.

The capacitor is what I've been thinking, but I won't have a chance to test it as my soon-to-be-x is keeping the car.