Any sudden change of any sort can cause calamity.
Sudden intelligence was explored in a movie called "Charly" that came out in the 1960's: a retarded man is cured by a brain operation and begins to acquire normal intelligence. As he does, much upset results.
The same theme came up in a couple episodes of the various Star Trek series. I think the whole notion of sudden intelligence might have been suggested by what happens in some small percentage of cases of bipolar disorder: their problem solving abilities increase exponentially before the mania peaks. But, of course, they crash eventually and there is emotional calamity.