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Slapping sound when sunroof is open


I bought my 2001 C4 new, and have 33K on the clock. About 6 months ago, I started to hear a "slapping" sound when driving with the sunroof open. Feeling around the area, it seems there are what feel like straps running across and under the headliner, and these seem to be the source of the slapping sound, as I can press on them and stop the noise. It's as if something that used to restrain them is gone. Any ideas?

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