I have a 1.8T (B6) Model but my roof does these things when outside tempertures are unfavourable to the climat control hense too cold or too warm and the roof closes to aid cooling / heating....I think it does that when the polen filter kicks in hense if you drive on a dirty / disty road it closes roof / windows to prevent dist getting in....I am not sure if the old A4's had these features but maybe it answers your question