The Ai (both old and new versions) have a habit of forcing players to lose team games.

Firstly, it attacks teammates, destroying their chance of a bonus where the border would otherwise be undefended.
Secondly, it doesn't use cards. ever.
Thirdly, instead of going for bonuses, it often follows the path of least resistance.
Fourthly, it doesn't follow any pre agreed to borders between players.
and Fifthly, it spends more armies attacking teammates than it does

I suggest that in team games, teammates can set borders on their Ai(s). They can also play cards for the Ai. Most importantly, they can give Ais a priority list. So that the Ai will always have a clear objective.

Those are my thoughts. Are there any other things that need to be fixed in regard to an Ai playing on a team game.

The AI can't be controlled by teammates, but you might want to check out this idea: https://warlight.uservoice.com/forums/77051-warlight-features/suggestions/1240763-teammate-takes-over-for-booted-surrendered-player.

Firstly, it attacks teammates, destroying their chance of a bonus where the border would otherwise be undefended.

View the AI's orders and or out-delay the attack that the AI is making.

Secondly, it doesn't use cards. ever.

The AI uses cards if or when the whole team is completely AI; never uses cards otherwise in team games.