DS1 did the same thing; like Santosha I blamed it on the shiny surface and what this did to his depth perception. He all of a sudden seemed to loose his balance when he looked down, like when you are standing in the sea and the water runs back past you IYKWIM. I just held his hand tight and ecouraged him to keep walking; after a while he got used to it and now it doesn't bother him anymore. HTH
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