*solution
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Did you try heating it in a water bath? From my limited chemistry knowledge I'd say either it got too cold at some point or the concentration is too high..but yeah I'd just heat the container slowly in water and agitate it..then let it cool and see if it starts to come out of solution again. If it does it again then you might need to add something. Just my .2.
im also no expert, but a hot water bath would be my best guess too
as everyone said, hot water bath. if it continues to crash it could be too high of a concentration.
Editing this because I actually read your entire post. If hot water bath doesn't keep it in suspension, then you can add some bb and that should help.
Thanks, I will try to add more bb in it.