Power Steering Fluid problems of the 2012 Dodge Avenger

The power steering fluid is leaking, the resevoir was completely empty and I had all the fluid all under the my car and the steering wheel is almost impossible to turn. . I live five to 10 miles from the dealership, so I went to gene's Dodge of fairbanks on 11/27/2012 at 5:30 pm alaska time. One of the mechanic came to look at my car and when I started to he knew just by the sound it was to power steering resevoir was completely empty and noticed that there was also a leak. I made an appointment for 12/06/2012 and was top off with atf+4. The next day I went to work no issues, it wasn't 3pm on 11/28/2012, my car was making the same noise and when I checked and saw that my power steering was out of fluid again so when I refilled it it took a whole quart. I called the dealership right away and took the car to them and got a rental covered under my warranty. The next day on 11/29/2012 I pick up my car and was told that the power steering hight pressure hose cracked and was replaced and that this is a common problem and that is why they keep the part in stock also that they will see me before winter is over. On 11/30/2012 from 9am I am to work a 24hr shift and so I drove to work no issues, however, between 9am on 6pm all my fulid from my power steering tank was gone and so I put some more fliud in because the steering wheel locked up and would not turn. As I went to turn the wheel to get the fluid flowing I retuned to hood to close it and as I was putting the cap back on the tank I heard the noise again as if the tank was enpty and as I look the poweering tank was empty and all the fluid was on the ground, any reasons why this may have happened other then it was -30 to -35 degrees over the night?.