I have a Late 2013 imac with 3tb Fusion Drive and an Apogee Duet 2. The issue is that when playing audio through my duet, the sound starts to detoriate after about 5 minutes, and eventually sounds like a crackling mess. It's a widespread issue, apparently. Apparently using a thunderbolt dock solves the problem, correct? Can anyone confirm if using an external thunderbolt display solves the problem as well? Also, does anyone know when the next OS update will occur? Apparently it fixes the USB audio issues.