Adding the resolution here in case anyone else has the same problem. It turns out there was an issue with Software Update 10.1.1, the dealer had to re-install. My service advisor mentioned there were other Lightnings in the shop with the same issue. *The 12V battery was fine.
I recently had my truck in for service for a software upgrade to fix an issue with the parking sensors. The service advisor mentioned the factory recommended additional updates which they installed. Ever since then, I get a "System off to save battery" message when I turn the truck off. I also...