When the game asks you to hold the remote on a flat surface, don't do it. Just hold it stably as you would in the default position when playing. I always rest my hands on my lap when playing, so I just hold it that way. Maybe that'll help?
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Yoblazer: http://oi53.tinypic.com/2hd0dh1.jpg
Watch and you'll see... someday I'll be... part of your world!