What brand of appliance do you have? If it is GE, Hotpoint or RCA, you can call GE at 1-800-626-2000 and they will be happy to help you out. If your refrigerator is 15 years old, you might consider upgrading to a new one; there have been many advances in features and energy efficiency over the past few years that are worth taking a look at.
If your fridge is a different brand, you can try searching using copernic, www.copernic.com for their website. Most refrigerator model numbers can be found on a sticker on the side of the freezer door, or frame, or on a metal plate stuck to the front of the refrigerator frame, usually near the bottom hinge.
I cannot be more specific, because I cannot see the problem. You might check to make sure your hinges are still all screwed tight and adjusted to the proper places.