Mine was bore sighted in just a few minutes. The gunsmith had no problems with mine. Mine was a 2nd gen X-Bolt.
My father bought one of the first years X-Bolts and had his bore sighted as well. No issues there, which is why I had mine bore sighted.
Seeing as your gun shot fine before, either your scope still has a problem, or the bore sighter has a problem. My money would be on the scope being the problem seeing as the gun is proven to shoot true, and I'm betting the gunsmith is using a tool that has not had problems in the past.
Still, tools wear down and fail as well. I know that from personal experience.
Take your gun out with the scope on it and shoot it. If the scope is the problem, then it will be evident in no time.