I had a fleet Sharan that did that, culminating on it deciding to wind all its windows down and sulk in that state one Christmas in the peeing rain.
The fault was in the control system and caused by damp getting into the control module in one of the doors (hence why it happens when it rains). Apparently it's a German requirement that vehicles involved in an accident should unlock themselves and open windows to allow the passengers to escape. A spurious triggering of this system leads to the results seen.
I was led to believe at the time that UK spec vehicles shouldn't have this system implemented and that Sharan was a misbuild.....
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