I agree how to prevent it happening, but there doesn’t have to be a fault. This from a Mercedes dealership in the same article:
“There was no surprise at the dealership,” he writes. “This happens,” he was informed, due to “electronic activity that happens passively and constantly.” He was further advised to keep the car on a “trickle” charger that plugs into a wall outlet—hard to do at airports—or disconnect the negative battery terminal.