Hi @Swindon69, let me see if I can help out here.
Have you tried using different cables/different plugs in order to see if the lack of charging is due to a malfunctioning plug/cable? It is always advised to use an original Sony charger and USB cable specifically intended for charging your device as other chargers may be too weak or too strong as they may have a different electric current rating (mA).
Also, Make sure that the charger port is free from lint, dust and moisture. A blocked port can prevent the USB connector from fitting properly, and therefore prevent charging. Ensure that the USB port is completely dry, and gently remove any lint or dust using, for example, a wooden or plastic toothpick.
Another thing that you can try is to reboot your phone in safe mode to see if the charging works better there. All apps downloaded from Play Store is temporarily deactivated while in safe mode and by doing this, you can see if this behaviour is caused by a downloaded app. For more information on safe mode and how to use it, click here.
Try this to begin with and let me know how it goes!
