dun worry too much, just go to SC to have it realligned.

Happened to me once...but it was driver's door that became ajar while i was driving and the warning alarm went off 
I informed the SC when i sent in for my 1k service and they adjusted the hinges and told me to monitor if it happened again.

Still trying to figure out whether it was the hinges or hantu masuk as i was passing by a graveyard when it happened   

sure know, better got to those 3S ones, so that they can get the bodyrepair guys to allign it. they can do it in an instant, unlike the sc guys, allign worse than before.

i tell u wat la, its a straightfwd thing, u can even do it yourself as its easy n safety more important.
just use big screw driver and loosen the hinge at car body to left/right and adjust till u get the door aligned .its easy actually