Another possible issue is damage to the primer, or specifically the little chemical cake on the inside of the primer.
"the cause of the misfire was determined to be from the primer mix being knocked out of the primer when the round was cycled through the firearm multiple times"
This was from an analysis done of a round that failed to fire in a police officer's duty weapon during a shoot out. I don't recall the original place I read that. Googling it leads to links to other forums, and I'm not sure if posting links to other forums is against the rules here so I'll leave it up to your search skills to find.
"the cause of the misfire was determined to be from the primer mix being knocked out of the primer when the round was cycled through the firearm multiple times"
This was from an analysis done of a round that failed to fire in a police officer's duty weapon during a shoot out. I don't recall the original place I read that. Googling it leads to links to other forums, and I'm not sure if posting links to other forums is against the rules here so I'll leave it up to your search skills to find.