Volvo Forums - Volvo Enthusiasts Forum - Variable whistling or humming noise XC60 2017

I have just taken delivery of a new XC60 2017 model with Volvo roof racks. I experienced a variable humming or whistling noise not correlated with road surface, engine speed or car speed. The noise can be evident between 20 and 60 kms per hour.=left
Took it to the dealer and the service guys said that this whistling or humming noise happens all the time. Sales guys said 'what noise'. =left
Changed roof racks a few times. No success. Eventually tried taking off the roof racks and noise was still evident. =left
Help please it is driving me mad. Only done 2,900 kms so far.=left
Rob