Yep, still thinking about this and I'm questioning why you've chosen to post such a vague title here about what's a very major and unusual incident as reported here by you. If you're trying to find more responses here to this question: "has this ever happened to any other volvo", why not make a thread title that gets right to the point like "My airbags blew off accidentally, anyone else experience this?"
Just a thought. The current title is so vague that most here might not even click on it as is.
One more note, this being a technical forum it's then only natural for some of us to ask questions and that's really all that I've done here so far.
I do hope that you keep us updated to this very unusual event as we'd like to know the cause. I think that that's only fair, don't you?