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I have to wonder if the loose bolts are an additional problem not really related to the door falling off. Bolts should have lock wire keeping them in place. Even if they are loose, a door could be rattling or hissing air, but I'm not sure how it comes off. I'm not an ME, or a manufacturer, so I could be wrong, but if so, I'd like to know how that happens.
A current working theory (from people more expert than me) is that Spirit Aerosystems (who builds the fuselage) does a loose install of the door for transport to Boeing, who then does a final install of the interior. Since this door is usually removed for the interior installation the theory is that it isn't and the loose install is what has ended up on otherwise flight worthy planes.
Here's how I think it went down:
Conference Room, Spirit Aerosystems:
"How can we reduce the hours needed to get the fuselages out of the door?"
"We could skip tightening the door plug bolts. After all, they use them at Boeing to finish the interiors so it will actually save them time, too."
"Johnson, get this man a promotion!"
Later that year
Conference Room, Boeing
"How can we reduce the hours needed to finish these interiors?"
"We could just skip removing the door plugs and do it all from the actual doors. Then we don't have to re-do something already done at the supplier"
"Johnson, get this man a promotion!"
Damn you Johnson & Johnson!