2018 S60 T5 Noise from engine

Hi,
I notice a weird noise coming from my engine(I believe) especially when I am going over 40mph. It changes in intensity upon acceleration and deceleration. I brought it to dealership and it made the noise all the way there and of course it stopped once I got there. They said nothing was wrong. It went away for a few months and now it is back. Please help.
 
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