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BQ24770: Trouble in BQ24770

Part Number: BQ24770
I have a customer described that:Battery management charger BQ24770 with load and charging at the same time, when the load current changing, the battery charging immediately stop, no matter what instruction sent to chips. And after he modified register to stop charging through the SMbus modification, no matter what data is written,he could not start the chip to charge.  The schematic as attached.
Please give him some help, I will ask him reply below directly.
Jenny