My guess is comfort access is somehow one of the key players. My business partner has an 09 4.8 and drives 3 miles to work each day...car is two years old and i don't think he has 10k miles on it, and has more options than i do (ventilated seats) and NO comfort access and his car sits for weeks on end not being used when he travels and he's never had an issue.

With C.A. i know to lock the car each time i walk away, keep the keys far away at night, but suspect that this has been the major factor in my issues over the last year, and finally got to the point that the battery just couldn't take it.

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