Multi glock owner here to include 2 gen 3 G34s.Re the hinky G34. Send it back to Glock. If it it not digesting mainstream factory ammo like 115 g Winchester White Box and certainly 147 American Eagle along with 124 Speer Lawman, the problem is the gun not the ammo. You might put in a new recoil spring and a fresh, latest gen 17 round 9mm mag and give it one last try with the factory ammo mentioned above.
Now reloaded ammo unreliability is an entirely diffrent kettle of fish...
I am pretty sure it is not the ammo, but the gun or the mags. Ammo works flawless in other guns, either the factory or the reloads.
Might send it in to them. There was some rumor with the mag being the problem, but the spring could be also a problem. In NJ, I can only get 10 round mags, the 17 round mags are not legal here in my state.