In addition to the oil being allowed to resettle into the compressor sump, there's also the possibility that it "stopped working" because the auto-defrost timer said it was time to cycle. The AD timer shuts down the compressor and energizes a heating element to rid the freezer compartment of frost, then turns that element off and the compressor back on.
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There ain't nothin' more powerful than the odor of mendacity -Big Daddy
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