First thought is maybe junk in the striker channel. Don't see it much any more but in the past there was left over machining junk left behind.
You can take the slide off, hold down the drop safety on the bottom of the slide and push the striker back and forth and see if it moves freely. Should be able to hold the drop safety down shake it and have the striker rattle.
In Memory of Paul "Dietrich" Stines.
Dad: Say something nice to your cousin Shirley
Dietrich: For a fat girl you sure don't sweat much.
Cue sound of Head slap.
RIP Muggsy & TMan
"If you are a warrior legally authorized to carry a weapon and you step outside without that weapon, then you become a sheep, pretending that JOCKO will not come today."