Why would a well maintained 12 gauge semi auto Remington model 1100 fail to clear a spent cartridge after firing

There are a few possible reasons why a 12 gauge semi auto Remington model 1100 might fail to clear a spent cartridge after firing, including:

Dirty or clogged chamber: A dirty or clogged chamber can prevent the spent cartridge case from fully ejecting from the firearm. This can be caused by a buildup of carbon, dirt, or other debris in the chamber, which can interfere with the smooth operation of the firearm's action.
Weak or damaged extractor: The extractor is the part of the firearm that pulls the spent cartridge case out of the chamber after it has been fired. If the extractor is weak or damaged, it may not be able to securely grip the spent cartridge case, which can result in a failure to clear.
Weak or damaged ejector: The ejector is the part of the firearm that throws the spent cartridge case out of the firearm after it has been extracted from the chamber. If the ejector is weak or damaged, it may not be able to provide enough force to eject the spent cartridge case, which can result in a failure to clear.
Inadequate lubrication: If the firearm is not adequately lubricated, it can increase the friction between moving parts, which can slow down the operation of the firearm's action and result in a failure to clear.
Defective firing pin: If the firing pin of the firearm is deformed or damaged, it may not be able to strike the primer of the cartridge with sufficient force, resulting in a failure to fire. This can lead to a failure to clear the spent cartridge case from the chamber.

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Why would a well maintained 12 gauge semi auto Remington model 1100 fail to clear a spent cartridge after firing?