Hello @Chapm and may I extend a Warm Welcome to the Samsung Community Forum Section for Uk and Eu Members. 👋
Some troubleshooting steps are >
Ensure your charging port is free of dust and debris via using a torch.
Usb reset. Settings > Apps > Tap the 3 lines with the downward facing arrow, to the right of 'Your apps' > Show system apps (toggle this on) > OK > Scroll down, and tap on 'USBSettings' > Storage > Clear cache > Clear data, then restart your device.
Use a different Samsung data cord and charging brick.
Run the diagnostic tool in your Samsung Members App.
Send feedback via your Samsung Members App too.
A Samsung Service Centre can assess your phone.
If i can be of any further help please don't hesitate to ask 😎
