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This model has a history of faulty defrost thermostats, shown at the link below.
This part is what protects the unit from overheating when it goes into a defrost cycle. If it fails, the heater cannot turn on. So, it would certainly allow the unit to frost up as you are seeing. This thermostat is mounted at the very top of the evaporator coil that is accessed by removing the rear panel from inside the freezer. There are only two wires to it so it is very easy to replace. I suspect rep[lacing this part will solve the frosting issue. Of course, be sure to thaw the coil completely before reassembling.
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