Finding that your residential refrigerator automatic ice cubes are gradually getting smaller over time is a classic sign of an impending water filter restriction or declining household water pressure. As microscopic sediment and mineral deposits accumulate inside the water filter over months of use, the internal filtration media becomes choked, severely reducing the flow rate during the brief seconds that the electric water inlet valve remains open. Consequently, the ice mold only fills partially with water, yielding stunted cubes. You can troubleshoot flow rates easily by checking filter age. You can verify that your troubleshooting is successful when replacing the clogged water filter restores high water pressure and normal cube sizing.
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