The H2 roofs do this too. They're called "rest stops" and I thin it had something to do with saftey. There was a thread on this in the H2 tech section somewhere.
Try this, have all your windows up and open that roof up all of the way past the rest stop. Yours ears will get buffered from the wind while driving and it sucks! But if you only open it to the first rest stop and leave it there you don't get that with the windows up. With the windows down it doesn't matter.
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TAIL RATED!
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