Try shooting from a rest, or at least when braced against the shooting bench or sand bags. I found that this was the problem with mine.
The PF9 seems to be subject to limp wristing. Mine has been flawless with 115 grain ammo, but had issues with 124 & 147 grain. I had a range officer, who carries a PF9 try my Winchester 147 grain ammo in his pistol & it cycled fine, but he couldn't get it to cycle in mine. I thought this eliminated the case of me limp wristing, so I sent it for repair. Three trips (whole pistol replaced the last time) later, still does it. Finally I shot it from a rest, using 124 grain & no FTF!! Everytime I'd shoot it without the rest, had FTFs.
I would have not believed it because the difference in recoil is so imperceptable that I don't really notice it, but it seems to be just enough to make the difference. At my age, muscles don't respond to exercise like they used to, but I've started doing some wrist exercise. Last range trip, shooting one handed & with both strong hand & weak hand, no failures to feed through 53 rounds. Had two in the last 5 rounds, shooting with my weak hand, which I blamed on fatigue.