Refrigerator freezes contents

Question

We have a Danby mini-refrigerator that occasionally (lately every couple of days) freezes the beer/soda we keep in it. The cold control is set near the lowest setting. The unit sits on a covered, screened-in porch, but is exposed to outdoor temperatures (in Atlanta, often in the 90's).There is no freezer compartment -- it's just a refrigerator. The coldest portion seems to be the middle shelf - that's where the bottles and cans are most likely to freeze.What can we do?