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LM5013-Q1: The output was decreasing sharply when the input decreased to expected output value

Part Number: LM5013-Q1

LM5013-Q1 was used to generated 12V DC power supply.

It looks to be working well when the input above 12.30V.

However, when the input decreased to 12.20V,  it seems to be stopped, fre is almost 100Hz, which resulting in the output decreasing sharply.

The Minimum value is down to 6V and it results in The back-end cannot working. What can I do to advoid this case on the premise of  not modifying the expected output.