1. The charging cable or charger is damaged:
You can check the charging cable and charger for damaged or bent pins, or try to replace them with original chargers and charging cables.
2. The charging port is dirty or damaged:
You can clean up any sundries in the charging port at the bottom of the equipment, or check whether the charging port is deformed or loose. If the charging port is damaged, it may need to be repaired.
3. Overheating of equipment or software failure:
Move the device and charger to a cooler location, or force the device to restart. You can also check whether the device has the latest version of iOS.
4. Aging or damage of equipment battery:
You can check the battery health of the equipment, and if "Maintenance Required" is displayed, you may need to replace the battery.