It has been my experience that the LGD's are as variable as people. Just as in most of my Kangals are very bonded to the property, ocassionally an individual wants to roam around. I do not mind it if they are chasing the coyotes off, but I want them to return promptly.
And with one starting this, others can get sucked into this bad behavior. Just like people I guess,,,,haha.
When I ran Pyrenees for 16+ years, the wondering was more of a problem. The Kangals have been great, except for an individual or two. The Boz have been mixed, with two being perfect, and with one male constantly roaming. He always comes home, and seems to only go out about 1/2 a mile or so. I think with their perimeter defense type of predator control, this might be normal. Checking out the boundries.
The suggestion of chaining for a bonding period has worked wonders for me. With sometimes being almost funny in that after released, for months spending 80% of their time in the area as if chained.
Good luck everyone,