Sadly, no thoughts, but I noticed mine doing this yesterday.
Under medium acceleration, it almost sounds like the demister has been turned on, but it raises with engine speed.
Engine warning light also came on (code 009), so I’d turned down the radio to pay more attention, it may have been doing it a while.
Fuel consumption has also dropped over last few days, i thought it might be the DPF running too - or perhaps not clearing properly.
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