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my fridge freezer is not very cold as it use to be?

I noticed, 2 of my freezers shelves not working and I feel all the food gets soft and defrosted.and when I switch it off for about 10 minutes and switch on again it start to be cold again for a few hours then defrosted again.
I had my fridge freezer for about 5 years.
so please tell me what do I have to do?
Mrs.Fascella, May 2009