Default Charger defective? Overheats & intermittent non charges

I've notice since day one that the charger gets excessively hot. So much so you can't hold it longer than a few seconds before you have to let go. Is that normal? Lastly, I noticed it would charger much slower, at times. If I let it cool off. Reboot and start the charge again, it goes back to charging normally.
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