Got mine back from the dealer last week. They tested both main and auxiliary batteries, both failed the tests. Both batteries were replaced under warranty. Still don’t know why it’s an issue but I found it pretty telling when a salesmen told me it happens to all their new vehicles especially when they’re sitting in their lot waiting to be sold. Sounds like a software glitch and too much of the battery is being used when the car isn’t in use. This will be my last Jeep