Fridge. Water keeps appearing in the freezer and then drips into refrigerator.It looks like the

Question

Water keeps appearing in the freezer and then drips into refrigerator.It looks like the water will freeze and build up in vents.I have no water hooked up to unit and the setting is set to what is recommended.The food in freezer is fine it stays frozen. I have cleaned the ice off but the water keeps coming back and I also checked seal on door. Thanks Mark