Why does my trunk open on it's own when I am driving. on 2011 BMW 528i

Sometimes when I am driving, usually city-lower speed and when it is raining, the trunk of my car opens on its own. I stop and close it. It will then usually happen again a few times. Then it won't do it for a while so I forget it. Then it happens again, but never when I am at the dealer. The dealership here is terrible and no one has been able to tell me why this happens.

by in Peoria, IL on December 21, 2013
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2 answers
ANSWER by , December 21, 2013
Possible bad lock actuator.
ANSWER by , December 21, 2013
If it is still under warranty, better try to get it fixed before it expires!