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LM3429-Q1: Gate rise a pulse

Part Number: LM3429-Q1
Other Parts Discussed in Thread: LM3429

Dear Sir/Ms.

My client reported that their switching frequency would under certain circumstances change from 400Khz to half of 200Khz. I directly ask the customer to measure the inductor current and Vgs, and I see that Vgs has this kind of waveform when something goes wrong.
Have you ever encountered this problem? In which direction can I suggest customers to start looking for?

Normal

Ch1 Vgs, Ch 4 IL

Not Normal

Best Regards,

Kami Huang