I'm having the same problem, large puddle of water, and loss of charge while sitting in garage. Seems like the car is always running... constant low grade humming.
I've already had many strange & frustrating things happen with this car, including having to fully reboot it after it froze up twice (out of about 6 times driving, just got 2 weeks ago).
Other things like: taking 3-4 minutes to wake up car from the app, many bluetooth (iphone5) issues, front wheels vibrating a lot especially on left turn at speed, doors seem to not close as easily as I would expect, random windows descending while driving (about an inch, as if door was being opened), etc etc.
Gonna call Tesla service soon.