No trussrod problem. Its just the old neck was to unstable, even with the weather of my city being the same during all year. And I didnt like the neck shape too much, and the curvy radius. So i found this super cool luthier from the state of São Paulo that will build a new neck. Oh, btw, Im glad my bass is bolt-on. Here are the specs: 3 piece neck - quarter-sawn maple with a center stripe of pau ferro. Pau Ferro fingerboard. Flat radius with zero fret. Neck profile: We will try a mix of asymmetrical Stevey Ray with a D shape. So it will be like an slightly asymmetrical D shape. I think that this will hold my thumb on the back of the neck much better than the Fender C shape. Any opinions, advices? They are very welcome.