I've had my 900 for a couple months now. I use my 900 almost exclusively w/ Traktor Scratch Pro 2 and CDJ's w/timecode. On 3 seperate occasions that I can remember, I've had really bad distortion in channel 2 of the mixer (my deck A). It's so bad you cant tell what song is playing. The first couple times I thought it was because my sampling rates were different on the mixer and on Traktor. I would turn off the mixer, reset everything, re-start Traktor, and everything would work for the short period I tested it. This last time, I know for a fact the sample rates were set right. I cant remember if it has happened with any other channel other than 2. I'm thinking it's defective. One common thing in all 3 occasions is that earlier in the day I will have a long session (2-5hrs), and when I start using the mixer again later in the day it will do this. Any help guys??