I bought a 2014 model S 85 last month and i am having issues with the 12v battery. I figured out if i plug in car at home or supercharger it will keep the 12v battery charged as it should. Car always runs perfect when the screens are on. Never had any error codes. Then i can drive it for hours and everything is perfect. But i will go to a gas station and get something inside and 5mins later the 12v battery has too be jumped to start again? I replaced the 12v hoping it was the issue but it still does the same thing with new battery. i cant figure out what is going on. if the dc to dc charges while driving and the screens are on. and it charges while plugged into to any charger. why would it not charge the 12v battery while driving sometimes and then have the 12v die in 5 mins if i walk away from the car? I can leave the key in and door ajar and walk away and it wont die. but if i go inside and the key is far enough away the car will turn off and not restart without a jump? Anyboy have any clue? service is 3hrs one way.