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Slipping Truss Rod.

Take it to a good tech, or to a luthier. They will at least be able to tell you how much it might cost to repair.

If the adjustment nut is slipping there is a chance it could be fixed without spending more than the bass is worth. But, if it's more of an issue with the anchor nut (the one on the end you can't access) you may have a much bigger problem