I had experienced the noise - infuriating, as it appeared also to happen almost randomly. Sometimes a track would play distorted, then the next day it would be fine. Playing MQA files was an issue almost always, as were other combinations of bit depth and sampling rate. I eventually fixed the problem by using HQPlayer and forcing everything into a max 192kz 24 bit signal. It has the added benefit of adding some stunning filters to the mix and really improving the performance of the system. I had previously tried getting Roon to force sample rate conversion but for some easing that didn't fix the problem whereas HQPlayer certainly has. For completeness I should add that I swapped out my DAC for a Mytek Brooklyn DAC with native MQA deciding and that worked flawlessly while I had it. It just did sound especially pleasing so I went back to my slightly quirk tube DAC. That was an indicator that maybe it wasn't the DDC that was the issue. Hope this helps. I'm eager to establish the root cause of this as well.