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how old is your battery? I'm similar mileage as you and car sits in the winter on tender. My second battery were replaced during the last month of my warranty so it's 7 years old.
Very similar symptoms like yours so I just when to CT and get a new battery, even CT told me the battery was tested good and has that blue indicator on the battery still showing. I changed it anyway due to its age.
everything went well for 1 week. then it started again. no code. My indi then lent me a portable OBD2 handheld. I drove around while having it plugged in then the handheld recorded everything.
New alternator..
been good ever since..
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