1. Try to charge the charger to other mobile phones, and eliminate the reasons for poor contact with the socket.
2. Replace the charger for testing or send it to repair for testing.
3. When charging, there is a third-party plug-in installed, you can uninstall it and try again.
4. Check whether there are dirty things in the charging interface of the mobile phone, and there are debris resulting in poor contact between the charging interface of the mobile phone and the charger.