I´ve spotted this once, where the TB of my team just stood around at the health crystal and did nothing for approximatly 5 min. But that never happend again (and it was without the enhanced AI mod I think) that badly. But still, they make a pause from time to time, for sure, (Maybe thinking about the situation ^^) on every difficulty level.
At which warrank you start? I´ve played some games starting at 10 and the AI cannot make the right judgement of that circumstance.
Also try enfo´s mod, it´s really a nice single player mod, I think.
http://forums.demigodthegame.com/384535