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This issue means that your refrigerator doesn't think the door has been closed. After 10 or 15 minutes of the refrigerator thinking that the door was left open, the lights will shut off inside to prevent the light bulbs from heating up and melting the liner or warming up the food. Because the refrigerator thinks the door is open, it will keep giving you these 3 beeps to warn you that it thinks the door is open. It's all related to the refrigerator thinking the door was left open. When you go open and close the door, you're then resetting the issue which is why the light starts to work again and the beeping stops. You either have a bad door switch or the door may be sagging and not hitting the door switch correctly when you close the door, or possibly the control board is bad and not reading the door switch properly. Since the issue is sporadic it's really not something you can test.
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