Just got a new Bluesound Node. Very disappointed!

I would agree, your Node has issues of some sort. A reset might do it, easy enough to try. For the $$$ the Node (especially the current one) sounds really good. 
 

Important: Audio clock trim

- BluOS uses small adjustments to the audio clock to maintain glitch-free audio synchronization. Disable this when using an external DAC that cannot cope with these adjustments.

There is a setting that you might like to change to see if it makes a different in term of sound quality

Bluesound has outstanding customer service. The IT guys helped me a couple of times. I can't imagine they couldn't isolate and fix your problem.

Return it.  There are other options out there, both less and more expensive.