If you're having a ground loop issue, it can present kind of like that, USB is a notorious cause of this. I can't run my H9s direct on USB or I get a big loop with the Helix, H9s, computers, DAW, so I always hook up the H9s on bluetooth for configuring and control...
A total lack of ground so there is excessive RFI getting in the digital can also corrupt unbalanced digital audio (SPdif) like that. I've even had properly grounded and shielded AES balanced audio quit in a high static environment doing audio for MNF... Static Guard became my friend. If you are in a situation where you get static zaps quite a bit, it can raise hell with digital audio streams.
Not saying you have any of these, just offer the ideas to consider...