Caffeine dissolvability

Hello, dear scientific community!

I have a question in regards to caffeine dissolvability. I dissolved caffeine in x amount of water at y temperature at levels at which caffeine is very dissolvable in water, and everything worked superbly.

Then I increased the water amount to x + t and also increased the temperature to y + s, and ideally, given the fact that caffeine is an endothermic reaction and also that none of the water parameters changed, the dissolution should have been easier, but it became difficult to dissolve.

My only explanation is the physical limitation of the impellar in use; can anyone think of any other reasons?

Thank you!!

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