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How can I repair my refrigerator that is not running correctly?

My refrigerator starts running and sometimes only stays running for a few minutes.Other times it will run correctly for about eight hours,and then not kick on for several hours causing our freezer/fridge to not stay cold enough.How could I fix this problem?The refrigerator is a Roper RTZILMXKQ03 The year is 2004
Richard, March 2010