Hull distortion .
If I were you, I would pay a naval architect or other qualified expert to examine the boat and provide a written opinion. If there really is a problem, you will have an expert witness to support your claim against the boat manufacturer. Also, if the manufacturer proposes a method to correct the problem, your naval architect can tell you whether it is a good solution, or an inadequate one. If you don''t have a bona fide expert looking out for your interests, then you will be at the mercy (or lack thereof) of the manufacturer. Good luck.