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I sounds like they didn't put an hysteresis in place - they set the charge/don't charge thresholds too close together and didn't allow for a "don't care" voltage in the middle. That would make it so sensitive that it would continuously switch on and of when the bettery is dancing around the exact full-charge voltage.
Either that, or the charging voltage is being sensed by the cut-out detector as a full-charge voltage coming back from the battery instead.
All speculation mind you, but it sounds like one of those anyway. I'd bet they are changing the circuit inside to add hysteresis or adding a delay between charging and voltage sensing. I image they had those in place, but something changed. Chip suppliers have a notice on their web sites that their chips may change at any time. Perhaps one of the chip manufactures changed something.
Pure speculation again.
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Average minds discuss events;
Small minds discuss people.
The best minds discuss sailing (and a little bit of politics). I don't know why. It's a mystery!