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As it happens, I had a brand new spare charger (to be installed at home). I've swapped it and it's made no difference - I'm convinced it's something to do with the car.

Thanks for your input, do you mean the cable from the charger to the car or from the power supply to the charger?

This is what has just been posted against my thread for the same issue - " When the charge rate on my 22 4S suddenly dropped by more than 50% on my home EVSE (and others I tried), dealer service found that the car's on-board charger needed to be replaced. Replacing on-board charger fixed it. "

Hi, I've just posted the same problem and am awaiting replies. So you're not alone with this issue!

I've had a Taycan 4S for 18 months now and always charged it on my 240v 32Amp home charger. I've always got a 7kwh charge rate until recently, it has now dropped to only 3.7kwh. I know it's not the charger, as I've tried others only to get the same result - around a 50% reduction in charge rate...