Could be network related or processing in some way can you show your signal path as this will rule out if the Nucleus is having issues or doing something it shouldn’t.
Also looking at PS audio DACs and they only support up to DSD256 according to their website. Which dac are you using that supports DSD512? The airlens only supports upto DSD256 via i2S as well according to its specs so I assume this is downsampling to DSD256 this has caused issues for another user and a Titan with the processing speed dropping too low to maintain playback.
Thanks for writing in - it’s good to see you on the community again!
Following up on your post, we too were not able to find the MK2 DAC having DSD512 playback function. According to the MK DAC website, it’s only showing DSD256 capabilities.
Certainly, let us know if we’re missing something here!