That was a cool article. It recently was -30 where I am and I had my BB in my jeans pocket and I snowblowed for about an hour ans it was slow but everything still worked.Here's an article from popular mechanics.
Can Cold Weather Damage Cell Phones? - Frozen Gadget Test - Popular Mechanics
There is probably a shut off built into the firmware OS that will turn it off before hand. Also wind you take into effect that it was windy that could also take more of the radiant heat away.
i think this is just a cell phone/cold issue, nothing wrong with the droid,.