Pops when streaming

Hello, 

I just recently purchased a Node2i to stream in my system. I'm using the Coax out to feed my Peachtree Dacit into an NAD amp. I'm streaming via hifi not direct connection. 

I'm hearing some pops and snaps when I use Coax out, which are not there if I use the Streamer's own Dac. What's even more confusing is that certain cables pop and snap even more. I've contacted everyone with no help or suggestions as to what is happenning. 

What could be causing the pops ans cracks when streaming? Is this a known issue, related to network, cables, dacs, streamers?

Any help would be appreciated. 

J