Make sure that the evaporator is not covered with ice or the back of the freezer compartment is not a sheet of ice. If so, there is an issue with the self defrosting components of unit. Self defrost timer, defrost heating element, defrost thermostat.
Ice serves as an insulator and will prevent the freezer from going down to where it is supposed to be. And if you have an ice maker it will not function unless temps are below 10 degrees.
If the defrost mechanism is fine and you have no ice back there then it is possible that you are low on refrigerant.
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