I had this same issue with a Sirius 298 (in 154CM).
If you opened it slowly, the liner would engage dead center with the heel of the blade. Nice and tight, no play. Closing was not a problem.
If, on the other hand, you allowed it to open will full vigor, the opening snap allowed the liner lock to slide all the way across the heel of the blade and meet the opposite liner. Still no play, and still nice and tight, but it was a freakin' bear to close. You had to "encourage" the blade to let go of the liner.
Pretty much the opposite of handy.
So I took it back to the factory. I figured they would repair it (I envisioned a new liner or frame). I reasoned thus because the blade had been signed by both Chuck and CJ at one of the factory sale events, and I figured that blades signed by the execs would not be something you just had lying around the place. I figured that if it needed more than a simple repair they would call me, since I'm local.
A few days later, I got my knife back in the mail.
It was perfect. Opened and closed exactly as you would expect, both for slow opens and snap opens. All was right with the world. But wait . . . what? The blade was now S30V? Hold on a minute . . . the two signatures were still there, but instead of the original "Chuck Buck '08" and "CJ Buck '08," those signatures now had '09 after them. On closer examination, and comparing it with my original photos, I realized they had replaced the whole knife with a new one. And then they'd taken the trouble to get the blade signed for me before mailing it back.
Talk to them. Let them know what's going on with the liner lock.
While I can't personally guarantee that they'll make it right, my own experience would seem to point that way.