During the beta I encountered an error that prevented me from even playing, I wrote a post about it in the forums and people have been saying they had the same issue. I changed it 54mbps and we've even had the hub replaced. Come launch day and I'm still having the issue! I can't play at all!
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Are you on the 2G connection? That's what I'm using at 54Mbps and it fixed it for me.
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Are you running wired or wireless to your console? There are a lot of issues surrounding the super hub and wireless. If you are wireless try going wired and see if that resolves the issue.