Yup, the same thing happened to my Go Blu. It was repaired under warranty after the battery expanded and was unable to hold a charge. The same battery problems occurred less than a year later.

Are you sure they are connecting using LDAC? Have you checked that "Bluetooth Connection Quality" is set to "Priority on Sound Quality" in the Sony Headphones app? I have not noticed any decrease in sound quality since I got my replacement pair in February. You're right, the new ones may seem...

I have also been having abnormal battery drain and excessive heat with the right earbud for the last month or two. My earbuds were ordered in Sep. 2021, so they're out of warranty. I chatted with Sony US Support about it yesterday and today, and they were very helpful. They're sending a free...

I purchased mine on eBay new from Japan in August 2022 with free shipping and only paid regular California sales tax, no special import duties. It was less than the current retail price in the U.S., and the price on eBay has gone down since then. I'm very happy with it.