Jimarcadipane, if you could remove the back freezer panel you’ll see the evaporator coil. Look at the frost pattern on the evaporator coils. Is the frost on all the coils evenly, or only half or only in one area. Frost pattern can tell us a lot. If the coils frosted evenly, issue is in the defrost circuit. Only half frosted the refrigerant is low meaning there’s a leak in the system. One corner frosted up usually means a restricted in the system. A certified refrigeration technician must do these repairs per tge EPAs guildlines.