It is possible that your thermostat's contacts point may be defective or contaminated.
This problem is quite rare but happen sometimes.
Other causes could include a sticky mechanism within the thermostat.
Maybe some liquids may have spilled into this switch. In some rare cases insects have know to get in and affect the function of these switches.
Other causes can include a weak electrical connections somewhere within the refrigerator.
If this happen too often, I would suggest changing the thermostat.
GE makes them a great deal of these thermostats and probably sells these to Kennmore. Make sure you replace it with a factory recommended thermostat.