We heard the slam bang sometimes during the day in our room, the room steward said it had something to do with the ship's bow (not sure if I remember correctly precisely what he said) and it would only happen during the day. We sometimes heard this noise in the dining room too. It wasn't till the last night that the noise was continuous throughout the night. We called guest service and they said it was due to the rocky ocean and sent us earplugs. Well, I've been on many cruises with rocky weather and never experienced anything like this. The earplugs were useless. I think guest services and maybe even the room stewards just make up stuff since they either don't know the answer or are told not to give the correct answer. I love the Koningsdam but it wasn't a good end to this cruise.