You know, you may just have a buildup of corrosion on your battery terminals. Pop your front trunk, and inspect your battery.
It would not hurt to get the battery posts cleaned and insure you have a solid connection at all times.
It might also be your alternator going out, but this is just a guess on my part. Sounds like you need to get it into a shop before it causes you to become stranded on the side of the road.
There's nothing worse than seeing a Porsche sitting empty on the side of the road, in need of repair from a breakdown. Ugh.
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