You not the only one have this issue.
I have been on Beyond for a month.
Two of my sailing I did had creaking sound in my cabin all day long.
It was so unbearable that on one sailing I had to wear EAR PLUG when I went to bed.
I have decided to cancel my April sailing on Beyond and move the booking to another transatlantic.
Trust me I have many sailings with Celebrity, been on many rough sea.