The last few months my neighbour has been slamming one of her internal doors constantly. She'll slam it 3-4 times within 5 seconds, so I'm guessing the door must not be fitting properly or be loose or something. This can happen multiple times during an hour though and it's driving me nuts. She has two young cats and I'm assuming she's closing this door to keep them out of whichever room.
We're always polite to each other and say hello so I know the logical solution is to speak to her about it. I hate being confrontational so I don't know how to approach this in a friendly but firm way... Help?!