Streaming music, even high res files, doesn’t really require that much bandwidth - nothing near streaming video. And, you’ve got pretty good speed, so I’m skeptical that’s where your problem is. Are you sure it’s actually in your digital stream? When you’re getting the noise, have you switched to other sources to see if it’s present? A cap going on some of your solid state gear, a loose wire, or a cable going bad would all make that type of noise. Or, it could be something going on with your streaming as you suspect. But, don’t give up on streaming just yet until you know.
My $.02
My $.02