Unfortunately not all PF9's are reliable. you are lucky if you bought one that is reliable out of the box. I bought a brand new PF9 from the LGS and mine had issues.
I would suggest the Taurus 709Slim if you want something in the same price range and size. IMO it is "updated" design and will still pocket carry easily. Mine even fit in the same holster I used on the Pf9.
For those who doubt Taurus reliability, I owned both the 709 (9mm) and 740 (40cal) and both were flawless and never gave me any problems.