I did read for the Samsung fridge freezers, Energy saver on some models will turn off the heater on the door to save energy as well as automatically turning off the circulation and exhaust fan when the compressor is off.
And as you say, Ice buildups can occur on the evaporator coils due to defrost heater which normally turns on several times throughout the day to melt away any frost, but due to Energy saver mode this happens less often.
In a completely sane world, madness is the only freedom (J.G.Ballard).
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