Units stop patrolling

[EdgeOfChaos]

I have a problem. I start my units patrolling at map initiation, but at a random time later, some of my units stop patrolling; they just stand there.

Does anyone know why this happens, and how to fix it?

 

[Solu9]

It's caused by a stupid AI.
If you want units to patrol properly you need to trigger the whole thing.