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The AI hasn't been enhanced; that's beyond my capabilities ;) It's given an advantage at the start: more troops, more buildings in the city (you can see that the hero immediately receives a Castle and a Capitol, but that's not all), more experience, and better stats for the hero.
At what point in the game are you playing? It seems to me that the map can be completed faster. It's clear that the longer the game goes on, the greater the human's advantage over the computer ;)
The error is appearing again, that's not good... I'll continue testing.