Apple USB cables tend to be pretty tight-fitting as well. That's not a problem. If anything, it should result in better pin contact. Checking the bios settings to see if anything can be changed related to USB might be worth trying. You could also try a USB 2 hub (or Schiit Wyrd) between the computer and DAC as sometimes the issue with the newer chipsets.
3/19/17 at 5:26pm