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Amana refrigerator parts and Whirlpool refrigerator parts (along with the rest of the popular brands) depend on the proper function of the refrigerator's thermostat. If the thermostat goes bad, the entire operation of the rest of the refrigerator parts is affected. If you have frozen food even at the lowest temperature setting, you should test and replace the thermostat if it is defective. It is often found at the bottom of the refrigerator under the floor, but some models have it located in the back of the freezer compartment. You may need to remove the floor panel, or shelving and other obstructions to get at the thermostat. Frigidaire refrigerator parts, Whirlpool refrigerator parts, and others may be easy to track down on the internet and order, but if you feel a particular job is beyond your expertise, it may be a good idea to order a repair manual for your unit and get some additional information before attempting a do-it-yourself fix.
You forgot to mention that this problem can also be caused by improper airflow within the unit. If the air flow is to slow, the cool air will fall to the bottom of the refrigerator before it hits the bulb sensor on the thermostat in the refrigerator. This causes items in the crisper drawers to freeze. This is the most common problem I have seen with the Amana Upright refrigerator. The air flow problem is due to the fact that the drain assembly has iced up and ice is partially covering the air return vents. The only solution is to replace the drain kit.
My refrig is at 55* and the freezer above 30* -Kenmore -- The temp is constant just 10-15 degrees above proper=I checked the defrost timer seems to be ok ?