Since we have the same name I will try to help you, there is more information needed so you'll have to investigate a bit, you'll have to be sure fan in freezer compartment is running 1st, then you will have to remove the panel to expose the coils to see if they are frozen, if they are it could be the defrost heater or the fan not running. First Unplug fridge and let defrost with doors open for at least 48hrs, check fridge section and around unit for water that's a good indication of fan or heater failure. Plug back in and you should hear freezer fan running, if not that could be problem let it run for a day or two and check temps, if they are normal and then start to drop and fan is running your heater may be bad, you can test with ohm meter with unit unplugged. other than that if all door seals are good and unit was functioning properly to this point the environment should not matter that much. Your temp diffs, point to a cooling problem and it sounds like frozen evap coil.