Very similar situation.
Continuing my experience with this - We started our most recent short trip the other day in temps in mid 20's, getting colder,. After about 150 miles mostly thruway, the TourX sat overnight temps in teens (deg F), no issues powering-up and starting next morning and drove another 100 mi or so up to the Adirondacks. She sat overnite in single-digits - no issues w/battery power. All the while, no ASS. (although I did see first occurrence disappearing/reappearing backup camera lines). I recall volt gauge was at about 13.4 V after those short trips. Will be keeping an eye on things, and keeping a charger with me for the rest of this little trip, and will have Dealership look at it when we get back. Agree, seems like too early for battery to be going, but this is a different vehicle than I've ever had.