Hi guys, First time on this Forum as I'm slightly starting to bang my head against the wall here with the issues I'm having with a new engineered floor that was installed about 3 months ago. Since installation, the floor has become incredibly noisy, to the point where every footstep now leads to a cracking noise. As well as some visual rippling that is now happening across the boards. The floor does also "flex" in some places. The living room floor is about 25% concrete and the rest is wood. The hallway is solely wood. In both cases, the floor has the same issues. The floor is a Natura Oak Tyrone Engineered Wood Floor. The boards are 14mm thick with a locking mechanism and have a 2.5mm veneer. The floor was laid with a Gold underlay and I'm told has at least a 12mm expansion gap around all sides. Any ideas?