I have a 13 month old apartment size Magic Chef refrige. It stopped geting cold about 1 month age. I uplugged and it work fine for until now. Same thing. Left it unplugged for a while and now it works fine.

The fault is very much with the auto defrosting of your fridge. When the firdge stops cooling you are unplugging the fridge to allow it to defrost. As there is so much frost in the cooling coils there will not be any convection of the cool air from the coil as it gets blocked. So after defrost the coils get cleared and works fine till the next time frost appears. So first of all remove the freezer compartment rear covers to access the cooling coils, check for break in wires to thermostat, to the deffrosting heater or open coils in the heaters.Now trace the wires to the defrosting timer which is a 8 hours timer for defrosting the coils by the heaters. You can see if the timer is working. Now one of these could be the culprit but you will have to make sure by testing each one and confirming before replacing. Please do this step by step. Hope you get it right. If not familiar get help. Good day