I have in the past, when I ran mine wirelessly, run into this problem. I usually had to reset the SB3 totally (google it, I think you hold down one of the buttons).
I would then repeat the setup, and it usually took.
Happy running wired now, for 2 years with 0 hiccups, and this experience with wireles irritation is part of what drove me to spend $100 on a dedicated PC, so I could run wired...