Well I'm joining the club of the 12V battery issue.
On vacation with my family at an hotel in the mountains 100km away from home, where I charge on 110V"12A (they don't have 240V but still kindly offered me a prime parking spot and a 110V plug
Drove the car for a few minutes Saturday and decided to leave the car parked in the main parking lot after the car was full (not charging anymore)
24 hours later (Sunday), my app was showing a charge of 0 on the car... Went to see the car since it was supposed to be 80% full, I was able to open the handles with double-clicking the keyfob but both screens were dead, pitch black. Tried the press the brake, nothing... tried the reboot, nothing happened... I took the Tesla booklet with Roadside assitance number in it and called them. Reminded me that I should have their phone number in my cell's contact if ever I can't access the car.
Rep confirmed that I had an issue with the 12V battery and proposed 2 options: Towing right now or Ranger the next day. I chose Ranger since I didn't need the car that much for 1-2 days.
Ranger showed up the next day. He opened the door and.... the screens were up and running. What a shame for me. But fortunately enough for my pride there was and message "Car needs service, 12V battery issue" displayed.
The Ranger wanted to replace the battery and started the work. God it hurts to see his car being ripped appart. In the mean time, the national supervisor called him and asked that he not replace the 12V battery since the issue is likely not the 12V battery but something else and replacing it would simply postpone the next occurence. The Ranger noticed that the 12V was failing from time to time (intermittent issue), He finally decided to ask for a towing and repair it at the Service Center.
When the towing arrived, the screens were black again. couldn't put the car in neutral, very high setting and jack mode. I waited 2-3 min and tried to reopen the car with the keyfob double click. Screens were back. I did all the necessary to prepare the car for the towing and drove it on the towing while the 12V was lasting.
They said they changed faulty connectors at the Service Center and that it shouldn't happen again. sigh!!!
2 good news though: 1) They got my Vent upgrade and steering clicking fixed and 2) the car only lost 4km in 48 hours vs 30-40 mornally sitting idle
oh and one last thing, while the screens were black, I could still here the touchscreen fan noise... I can't get rid of that noise even when the car was dead.