Any aftermarket kit fitted?
Have you fitted any aftermarket kit, like a DAB radio or dashcam for example? If they are connected to a 12v permanent live feed then even the smallest thing can drain enough to confuse the battery sensor and the stop/start charging status. That happened to me with an aftermarket DAB adapter until I changed it to a 12v supply that was switched on/off with the ignition. It sounds like you are very tech savvy and will already have thought of this, but I mention my own small mistake just in case it helps.
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1980s: 1 x 745 petrol.
1990s: 3 x 855 petrol.
2000s: 1 x S60 diesel. 1 x S80 diesel.
2010s: 1 x S80 diesel.
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