Could be a cheap, Chinese LED light, or a bad connection. LEDs are really sensitive to connection, especially ground. & polarity in DC circuits. If the vendor just handed you a new one without seeing the old one or saying much, my guess is that they are cheap imports. Check the condition of the socket, though. The moisture rich environment of a refrigerator is prime conditions for corrosion. Check the 12v connections at the outside rear of the refrigerator also. As I said before, could be a loose connection, bad ground, or reversed polarity.
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