You may want to let the shop look at it. I have seen a broken manual safety lever cause this sort of problem. It may have to go back to Ruger to be remedied. The good news is that Ruger customer service is the best in the business and it'll only be gone a few days.
If you have not taken a firearm completely apart before, I'd recommend against starting with this one. There are a lot of little springs and stuff that can go away and hide.