Exactly :). Both AS and Border are working dogs who need to be set to work. A little playtime in the yard is not enough. One solution is to join a club where you actually get to work the dog, competition style, and keep working with it. Depending on where you are, winter can be h*llish for a border if it gets nothing much to do. It wants to herd critters. If it doesn't get sheep, it'll try herding kids, other dogs, and often (with bad consequences), cars. It also very much wants tasks :).
Another solution is to find it another (good) home, with a farmer who actually will use it in real work.
If one of these dogs get too little to do, it will eventually turn destructive and sometimes even aggressive. Not a good idea for a pure companion dog.