Sony WF-1000XM4 Repair : r/SonyHeadphones,WF-1000XM4 | Help Guide | Top,The Walkman Blog: Sony introduces the new WF-1000XM4,The battery life of Sony's earphones 'WF-1000XM4' suddenly became short, so I summarized the steps to get a free replacement, zero shipping and repair costs, even if the warranty has expired -,The Walkman Blog: Sony WH-1000XM4 and WF-1000XM4 Firmware Update,