Check that the door is closing properly. Bottles and jars on the door shelves or refrigerator racks sometimes hold the door slightly ajar and allow in room temperature air. Ensure the door seals touch the door frame and seal out air.
Open the door and examine the gaskets. Check for splits, tears or holes in the rubber which allows in outside air. Wipe down the edge of the gaskets which touch the refrigerator with warm, soapy water.
Reduce the frequency with which you open the refrigerator door. Cold and warm air meet every time you open the door, resulting in moisture. Never store warm containers in your refrigerator.
Dry all washed fruit and vegetables before placing them in the crisper draws. Moisture will either collect in the bottom of the draw or on the walls when fruit and vegetables are left moist.
Wait for a change in the weather -- moisture develops in a hot, humid environment. Consider relocating the refrigerator to a cool, dry place if your kitchen is humid during most of the year.
Adjust the humidity control on your crisper draws to a higher setting (if fitted.) Water released naturally from stored vegetables collects on the underside of the shelf above the crisper when the humidity control is set too low. The humidity control is usually found on the handle of the crisper draws.