I guess I would start with the battery connections and state of charge
I had the battery tested before buying new one and it was good. After the test I started pulling on the primary power cables and found the ground wire wasn't tightly secured to the battery pole at all. Dealer probably forgot to tighten after servicing. Tightened it and all good, probably saved me a $500+ dealer visit...I have been trying to identify a battery available in the USA. It seems you can only get a replacement from the dealer. In Europe you can buy FIAMM but not available in US. So far unable to identify a true US replacement AGM that fits.