Same problem with Frag. I've purchased product from a number of reputable sellers, all Frag and AOD 9604 exhibit the same problem.
I minimize the volume because I like minimum volume injections..
The precipitate is not condensation.
Re shaking it up, repeatedly see warnings not to violently shake the reconstituted vials. However, when I get down to the last dose, I add some BWt and shake the hell out of it. Really immaterial whether or not I break the chain at that point. It does indeed dissolve the stuff!
I intend to try 2% AA and see what happens. If unsatisfactory result, will stop at that. Getting close to vinegar.