Ok thanks for the advice, I have indeed been using bog standard cables I found in a drawer.Substandard USB cable has low bandwidth, it is noisy and suffers from dropouts, it sends the (sensitive) USB input of Chord DACs crazy! hence the white noise.
At lower bitrates, it just manages.
I wish Chord fixes that instead of white noise, it just mutes!
Change your cable, check your connections, it is a known issue (with bad cables).
One thing to note: I've been using the same micro-USB cable with the original Mojo which i also own, and never had this issue.
Is the Mojo 2 more sensitive?
Finally, which cable or cable maker would you recommend?