I have bad news for you. EAch of your shelves is part of the evaporator coil. This is the coil where the liquid refrigerant expands into a vapor. If only one shelf has frost, and the other shelves no longer do, then you have a low side sealed system leak of your refrigerant. You could have it repaired, but that is a major service call, and to have it repaired properly to EPA regulations, it is quite expensive.
sorry
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