Next time you have a light firing pin strike
First off, when you have a light firing pin strike, when you retract the slide, does the non fired round come back with the bolt?
If not, and you need to extract the magazine and recycle the slide, continue shooting the pistol until it happens again.
Then, instead of retracting the slide and bolt, try pushing it forward a touch. If it slides forward a bit, that means that the slide and bolt are not pushing the cartridge all the way into the chamber and the action is not totally closed. The hammer, with the bolt and slide not all the way forward, is hitting the lower edge of the bolt and not the firing pin directly, causing the light strikes.
The solution is a total cleaning and then re testing. If it continues after a field strip and cleaning, try a stronger main spring to push the slide forward after extracting a round.
This is common with shooters that have tried to fine tune their pistol with a lighter weight main spring and replace the stock 7 pound spring with a lighter weight spring. you need a lot of testing to confirm that the lighter weight spring is correct and usually switching back to the heavier spring corrects the situation.
Regards,
crankster