I have a friend that went through 3 remarkables due to failures, I didnt dig into the root cause but I suspect you might be right on the USB-C port since they all "stopped charging".
They also have the USB C charging quirk/cheap-out that if they're completely drained they will only charge with a low powered trickle charger until the device gets to some minimal level of charge, and then you can use a higher power source.
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Hilarious. Especially compared to the USB-C connector on an iPhone, which is secured by 6 (!!!) screws to the frame.