Serious DAC issues

hi !

first off i'd introduce myself, since first post ! nice meet , active in forum have read lot !

issue, can't find solution or similar case, sometimes, without warning , in no perticular configuration, macbook play awfull noise when listening music through dac (connected usb), not distorting in lightly unpleasant way, not small clicks , pops, fuzzy sound, touch trackpad or keyboard. i'll try , post video make clearer. way can rid of wait few seconds..

if has answer welcomed !

thank !

 

link more explicit video decripting issues :

http://www.youtube.com/watch?v=qz6lpnmnxii

 

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