I have a new macbook pro that i'm trying to connect a focusrite scarlett 6i6 to, for use w/ Garage Band. When i plug it all in my mic, keyboard, guitar sound great for 2 mins or so, then the sounds starts to crackle, and eventually (over a few mins), the sound gives out completely. I have to restart the focusrite scarlett 6i6, then it'll work again, but just starts to crackle, crackle, crackle!!! ..and i get anxiety.....
Focusrite Scarlett 6i6
Macbook pro: 2.7 GHz Intel Core i5, El Capitan 10.11.2 (15C50)