I have a 2011 V6 automatic transmission convertible with 60K miles. Bought it about a year ago and it sat in storage until I could start driving it this spring. There have been occasional greasy marks on my garage floor but nothing more than a drop or two. But two days ago, I parked it for about 6 hours and when I came back there was about a cup of transmission fluid pooled under the car. I've been looking out for more since then, but there hasn't been a single drop. What could cause it...

Leaking Transmission Fluid??