Need help!

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If you've seen the video, then you know that constantly adding path nodes to the monster is not required, since the monster is designed to patrol. The question is whether or not you've set up and added the path nodes to the monster in some kind of circular formation (e.g. 1,2,3... 39,38,37... 1). If they are set up in some kind of linear fashion (e.g. 1,2,3... 39,1,2,3... 39) then going from node 39 to node 1 may be an issue for the monster. The monster is designed to take the shortest path to its next destination, even if there are walls or other objects in the way. If it gets stuck, the game may decide there's no way to reach the beginning node (assuming getting stuck is a condition looked for by the game), which may deactivate the monster.