The dealer has performed a parasitic draw test to identify things like interior lights, left in an ON position. The initial test was negative, so they kept it overnight. Hopefully, they plugged it in for a charge cycle to see if that triggers the problem. I may have to set my alarm to get up...
The dealer replaced the 12Volt battery at 19,000 miles following a failure to wakeup the system. The new battery failed after two days of light use. I suspect the overnight charge cycle is leaving a circuit open and draining the 12Volt. The dealer Customer Service Reps are friendly, but don't...