Not knowing you from Adam, and how big or small you are, but the first thought that came to my mind was ....... LOSE SOME WEIGHT On a more serious note, you may have to remove the seat and inspect the springs and tensioners under the foam. Could be that one of them broke or some of your clips cracked (clips that stretch the fabric over the steel frame). Mount it on a set of sawhorses on a bench and simulate the sitting position while feeling/seeing (another person obviously) where the noises are coming from. Good luck