Hi beto, I don't know your exact refrigerator model, but without fear of making a mistake, your defrosting system is failing and it is completely blocked by ice preventing the passage of air to the refrigerated compartments. You can do the following ((if you have any doubts)) defrost it completely ((it takes time)) and start working again to cool until it crashes again I clarify that if you do not have knowledge you should call a technician because it may be failing the thermal fuse or the defrost and temperature sensors or the central plate or the internal fan or burnt resistor in short as you see are many components that where it broke one does the thing of filling with ice. To defrost moderately fast in the freezer part open door and place fan a few hours greetings luck