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Hi, thank you for sharing your inquiry. This is a normal operation for your refrigerator. In the insulated walls of the refrigerator there is a heat exchanger coil. This will produce heat. The longer your refrigerator runs the warmer the sides and top will get. If you need further assistance with your refrigerator, please feel free to contact us at https://www.insigniaproducts.com/contact-us Deneb M.- Insignia Support
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