Hoping somebody can help with this as i am lost as to what it could be.

I have a RR Sport 2015 model 4.4 that has done just under 45,000 miles. It has developed this whining noise that only seems to happen when the car is warmed up and has been driven for some time. It seems to only happen between 1500RPM and 2000RPM in all gears. It's seems to be worse when the A/C is running. When the noise is there if you lift of the accelerator, it goes accelerate again in comes back.

It does not happen all the time and if you accelerate hard it’s not there at all.

Hoping somebody might be able to give me some pointers on things to check.