Fluctuations in the voltage threshold can cause the chip to continuously shift between battery power and adapter power. Check the voltage divider resistors connected to the ACIN pin to ensure they have not drifted from their nominal datasheet resistance values.
Typically operates with a nominal 3.3V supply (though it drives higher voltage battery charging). 8682l Datasheet
Due to the QFN-16 package, the PCB layout must account for adequate heat dissipation via a central thermal pad. Fluctuations in the voltage threshold can cause the