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BQ25792: Bq25792 sys output unstable

Part Number: BQ25792


   We use your company's bq25792 to design the battery charging circuit, and the following problems appear:

1.The output voltage of sys is unstable when only VBUS is used. There is a jump every 1.37s,and the voltage of each jump will decrease about 2.12V,The captured waveform is as follows .

2.The output of sys is stable when using battery power supply or VBUS + Vbattery (Vbat > 3.5V) 

The circuit diagram is attached, please help to confirm the cause of the defect

.Thank you!