If you have the same problem with a new cable, then the charge port is probably worn out from connection being pushed in/pulled out, often sideways.
It’s a USB C port so cleaning to remove build up fluff or small deposits is much harder than lighting port on iPhone.
So any built up obstruction can cause these symptoms, you need to be able to get between central tab and the walls of the port & down deeper without doing damage.
If it’s worn out and you don’t mind having a go yourself, you can get new charging ports cheap here :
https://m.sunsky-online.com/list/101519/...
But you’ll have to be patient after paying, it can take up to 20 days to get to you depending on what continent you’re on.
Hope this helps
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