I'm not really surprised by this.
We had an 1988 factory wide body 911 cabriolet that had it's share of electrical problems. Just for hoots, the car would decide it was being stolen and the kill switch would kick in. We also had some electrical issues with our 1975 911, can't recall what they were, but sitting on the side of the road was a common occurrence.
Once an electrical issue starts up, they are almost impossible to track down, it's like a roof leak: The issue can be way up by the chimney, but the water shows up on the other side of the house in the closet.
Porsche needs to just give him his money back. At over $100K per car, they should work. Porsche is no longer a scrappy little sports car company, it's a luxury brand that goes fast. They need to act like one.
