I have had my Xfire for a little over a month. No problems to report so far. Today I came to a stop sign on a hill. I came to a stop and let off the brake, the car began to roll back significantly. I got back on the brake. After accelerating, I decided to make the block and see if the problem persisted. I approched the stop sign again and again the car rolled backwards when I took my foot off the brake. It began to pick up speed and died after rolling back 10 ft or so. Anyone else experience this? I havent had any other noticeable problems.

The car is an 04, auto, 11,000 miles.