UR44 noisy when direct into laptop but not dock?

Hi, just wondering if anyone is having or had a similar experience? I’m using a UR44 and if I plug the USB into my laptop I hear noise that sounds like a fan coming from my speakers which are KRK Rocket 6 connected to the UR44. The noise is there even if I have everything turned down on the UR44.
If I plug the UR44 into the USB on my doc there is no noise.
I have swapped USB cables and this doesn’t help.
There is no noise when using headphones with UR44.
Any ideas?