I had a similar problem with my note 9. just that I would charge it and while on charger would connect and disconnect while on charger.. and charger time was like half the day to full charge. tired multiple chargers still same thing happened. think that it was either the software went wrong. or that piece that connects charger to the phone got messed up or was lose..eventually just contacted service provider (since I pay for like warranty or whatever evey month.. they were able to send me a brand new one.. an a send the old one back once I got the new one..
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