Hi des – just a thought – not sure when you got your car – but has the software been updated – they seem to do a couple of updates a year.
Hyundai site explain how – but essentially a download to laptop then onto usb stick to plug into car.
I got my car end of July and haven’t experienced some of the traits you have noticed – not sure how much of the tech can be upgraded with software – but I would suspect quite a lot – maybe even Bluelink battery management?