We drive our eTron from California to Colorado a few times a year. Never an issue until last week. It was hotter than usual, at about 100F a lot of the way. When on the freeway, we always use Battery Hold preserving the battery for in town driving. But during this trip, the battery was drained while in Battery Hold after only only a few hundred miles of freeway driving. Almost like is was in Hybrid mode, tho it wasn’t. Anyone seen this before?