Yup, happened to me a few times. Once, when there was light rain. A few times the trunk lid opened up. Now, I keep my keys out of my pocket. I use a D ring so I don't accidently open the lid, roll down the windows/open the pano roof, or set off the alarm.

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'06 X5 3.0i - bought @143,123 miles (12/26/20)