Have you checked the pH of the solution? That would be my first step. Begin with bacteriostatic water and measure its pH, then add tiny amounts of AA until reaching around 4. You really need to test pH because the water alone can sometimes already sit at 5 and require only a little AA. I finish a vial within a week and notice no gelling or cloudiness so I dropped the AA approach. For anything kept longer than a month I would probably add more caution.
I'm attempting to reconstitute cagri with AA but running into repeated failures. Adding AA after the vial was already mixed with bacteriostatic water produced cloudiness. Starting with AA then adding the water also resulted in cloudiness and incomplete dissolution. Drawing 0.5 AA plus 2.5 bacteriostatic water together in one syringe before injecting into the cagri vial likewise turned cloudy and did not fully dissolve. The solution stays fine with just bacteriostatic water, but I'm trying to avoid any fibril risk. I've already used three vials.