With my situation last year I diagnosed it as the ECM. The dealer confirmed it with consult and swapped it out. Luckily I still had a warranty. No problems since.
My theory about why it went "possibly", was error on my part and leaving the key fob in the cup holder during storage. Ive always left the keys in my stored vehicles, and completely forgot about how there is a "wake up" of some features when the fob is in range.
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