I got a gift from a friends WF-1000XM4. I'm very disappointed with the earbud battery it dont last long it can be used for 1hour usage only im expected with good quality earbud for the price was paid.i try the troubleshooting spoke to the agent i did the troubleshooting still same issue. version 1.4 2. I have the earbud for at least  1year and nearly 3months old. I hope I get a replacement or repair. Sony i hope u fix the issue of the quality of earbud.