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LDC1314: About I2c scan test for ldc1314

Part Number: LDC1314

I made a circuit board using LDC1314. I used  ”I2C scanner” to check the address of the device. As soon as I turn on the power, I get addresses "0x2A" and "0x2B". But after a while, I can't get both addresses. What is the cause of this?