The actual connection depends on a sliver of spring conductor that.....from experience.....OFTEN fails......
Combine that with the common decision to daisy-chain the circuit using all 4 push-in connections and often the downstream circuit is dead.......
And to further complicate things some circuits use a common neutral....multi-wire.......When these lose a neutral due to the back-stabbed connections.......the circuit can energize to 240Volts......
Recently the NEC changed the code to allow only 14 guage wire to fit the devices.....
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