What other ammo have you tried?
I've only shot a couple of LCPs, both were new and ran like champs, right off the bat.
Could be a bad extractor or a bit of foreign material affecting function. Could be something more involved, but have seen Rugers and others with grit or a burr down in someplace it shouldn't be.
The extractor looks ok, I can't find any burrs or anything. I'll probably send it back to Ruger after the holiday rush, or maybe sell it with disclosure. Lots of people seem to like them.