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BQ77915: Charger is turning on and off repeatedly for parallel path configuration

Part Number: BQ77915

Hi,

my 16s BMS is behaving very odd, Charger is turning on and off repeatedly, When I change the BMS, the charger is working well. Then the BMS that it is defective ( i suppose ) working well again. Again after few complete charge and discharge cycles, it is working well. What Could be the problem?

Please find the attachment of my Schematic and video showing charger fluctuation