On my 2006 gti the small plastic flap that covers the latch hole boot side fell apart 2 years ago so i removed it and found boot shut better with out it. Only last week i put it back on had to pull all the plastic off up to the tail lights .The shaft had worked loose or was not installed right at assembly its all good now.I give the latch at least 5 seconds after opening and follow through with my hand light pressure on the vw badge wait 2 seconds and it always shuts.Hope this helps.
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