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-could be some buffer issue form the computer settings, but if you feel that you didn't go tweak anything on several computers, the chances of that go down.
- could be that the DAC has a problem (how long did you have it? is the issue something new?)
-maybe some shielding issue? that one is a wild guess but as you're not very clear about the nature of the noises, I thought I'd mention it. maybe try to put your phone around it while calling, maybe try to put the dac closer to the computer or other appliances and see if that increases the noises.