The refrigerator side is at present working properly , but slowly slowly, it will also loose its cooling.This will happen because, freezer side is the side which cools first, then the refrigerator side ( also called as fridge side)., gets cooled.If freezer side is not cooling / freezing properly then fridge side will also loose its cooling ability.------------
And later on both section will loose its cooling.-----------
As per the present situation, it indicates problem with compressor or problem with freezer side door not closing properly.---------- Or the temperature in freezer section is not set to proper cooling/ freezing.--------- So first inspect temperature, is it set right? If ok, then check the freezer door , is it properly closed? If ok, then its compressor problem.? The compressor is running non stop, this is indication of compressor problem.----------
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Later on both section will loose its cooling.
This will help.Thanks.Helpmech.