Most likely your defrost thermostat. Here are some step by step instructions on replacing. http://www.doityourself.com/stry/how-to-replace-a-defrost-thermostat
The banging noise is ice growing in the freezer and over stretching the interior.
Manually defrost the freezer.
Then run the refrigerator again. If things appear normal again then the automatic defrost is not working. A technician can sort that out for you.
If the fridge still is not cooling then the freezer fan is probably broken as well. A technician can help you there
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