Same thing happened to me today guys
my website http://www.policrete.com.au
was in spot B of google places and today its back down into the organic. Still page 1 so I won't cry too loudly but I didn't make any changes to it. And I doubt that the other guys all made changes to push me off the top 7.
One of the competitors that jumped into my spot also has 3 listing for the same keyword, all the same phone number but from different false address'.
I tried notifying google of this but they haven't done anything yet. And here I am pushed down the screen.
Not sure how it all works, would love to know tho.