We were in 11294 (Sunset Veranda) during the February 5 Beyond sailing. We experienced the same loud cracking/creaking sounds that others have experienced. The sounds came from all corners of the cabin, not just from the exterior, interestingly. I noticed that the ship was shuddering quite a bit while underway - the same feeling when the ship is docking. So, my theory is that there is a propulsion issue that is the underlying cause of the sound - sending waves of energy through the ship that shouldn't be there. We called down to Guest Services one night to ask what can be done, and they offered to give us another cabin to sleep in but couldn't guarantee that the same issues wouldn't be present. We declined. The next day, we saw engineering staff inspecting and making adjustments to cabins (tightening things, essentially). The noises were quieter after that but not fully gone. Later that day, someone from Guest Services called to apologize for the issue and offered us some future cruise credit for our troubles. The fact that they acted on the complaints and offered us compensation improved our feelings on the matter. Needless to say, we slept very well on our last night.
Bottom line, in my opinion, it is an issue, Celebrity knows about it, and they know how to give good customer service. 🙂