Mine is serial # 126-XXXX. It's gotta be nearly 20 years old. As I posted above, no problems. Sounds like extractor problems, either they're getting gunked up to where they won't grab properly, or the extractor itself is bad. I had that problem with a KP944, guy from Ruger said the heat treating might not have took. Sure enough, the claw had worn down, so they sent me a new one free of charge. Easy switch out on the pistol, looks to be harder on the 10/22.
Like I said before, I rarely clean mine really well, but the other day I did, removing not only the trigger housing, but also the bolt and spring. It was filthy under there. I housed it down with CLP, then held it under hot water, and it came back sparkling.
Don't give up on this gun, find out what the problem is, and have it fixed.