I would check the firing pin tip for signs of damage from gas erosion. They can be damaged from just one pierced primer. If it is damaged, it will tend to continue to pierce primers. In some of my other firearms, a simple stoning of the tip to remove the damage solves the issue. In lugers, most firing pins are numbered to the weapon. Stoning can shorten the tip enough that it will no longer function. I would replace the pin when firing.
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