I was going along with everything working perfectly, and then last night I started getting some clicks and pops when using Audio Station. When I use Macbook/Itunes/Audirvana with the NAS then via optical to the NAD D3020, I don't get them. If I use the USB directly from the NAS to the NAD, that's when it happens. It sounds just like a bad record and it happens quite frequently. Any thoughts on what might be happening? Thanks!