I definitely have that battery drain where the car doesn't start. Ford typically installs a new 12v and its good for 6 to 12 months. They've told me that if I want to find out why it'll cost me $150 for a proper diagnosis. However, their diagnoses have been faulty in the past on many occasions so I just grin and bear it.
Four months ago when I had it in the shop for another dead 12v, Ford mentioned the update because my Sync had stopped working. They said they knew about that problem but it was going to cost $200 to reset everything. I didn't have much of a choice since my screen was dead. Seems the drain is still there, though. Plus the drain on my Visa account!