BQ25710: VSYS is pulled low without an adapter

Part Number: BQ25710

Tool/software:

Dear TI Engineer,

When testing BQ25710, we found that when the equipment was turned off, the VSYS will loses power after about 20 seconds of unplugging the adapter and recovers after 3 seconds.

The schematic is as below:

The waveforms we captured are as follows (blue for VDC, yellow for VSYS, green for VBUS):

The register settings are as follows:

Can you help analyze the cause of this problem?

Thanks,

Kind Regards