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LM25180: LM25180 - SW Waveform becomes unstable

Part Number: LM25180

The target Vout is 10V. Vin is 20V

The switching waveform is stable at loading < 0.01A, the switching frequency is 11kHz.

When the loading > 0.01A, the waveform becomes unstable.

The TI flyback IC -- LM25180NGUR, But the flyback converter seems oscillating, below are the primary switching waveform & schematic. Do you have any comment or experience in this case?

BR, Gary