I had a 2008 Boxster S that kept having dead batteries starting about a year after I bought it. It went back to the dealer each time and after 3 batteries they were finally able to determine that the radio was the problem - even though it was off there was still a current draw...no one at Porsche had ever seen such a problem. I was compensated quite well for my troubles but it left a bad taste in mouth so I sold it after owning it for a couple years. My point is though that electrical problems can sometime be hard to figure out but be persistant and have the dealer continue to look into it.
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