House temp of 40-50°? The average fridge is designed to run in 70° house temp... If you lowered the house temps to save on energy while you were gone for any lengthy amount of time then your house temp affected your fridge thermostat to tell your fridge to run to maintain 0° in your freezer compartment... Has your fridge resumed normal operation since your return and you turned up the heat in the home??? If so, there's your answer... kooler
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