The problem doesn't have to be network-related from what we know, though. I had the same problem all weekend (did about 10 synchs), all over USB. It seemed like it was timing out on something, maybe waiting for the drives to spin up again. I know they were spun up to write the songs I was uploading, but the drives seemed to be spinning up again right before I got this error every time. Details: Mk1, 1 6G and 1 5G drive.