Enemy bots freeze when players comes into contact

I’ve got a problem with an enemy in an adventure game I’m working on. The enemy is a monster of sorts and when the player touches it, the enemy freezes for a while. Anyone know what’s causing this? How I can fix it?

please post a .blend file…

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Thanks. Sorry I had some trouble getting the textures to get wrapped. It said they were wrapped but when I started the scenario the textures disappeared.