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Hello, for the last year I've been using Sony's WF-1000XM4 Earphones, and during warranty period had almost no complaints to product. But last month or two - coin flipped. Earphones started overheating, for no reason. Due to overheat battery lifetime decreased several times. If usually I had 5-8 hours of playback time, but now - right earphone ~40min, left ~ 60-70min (time may very).
Factory resetting or any troubleshooting process didn't help.
I've tried to contact Sony Ukrainian call centre, or service centre, but didn't get any constructive response. Every proof I shared was ignored. Every link I've sent was denied.
Sadly seems that on Sony Ukraine's opinion warranty period = product life span
Service centre says they would not help because headphones are out of warranty, although this problem is not on my hands, just a defective batch.
Don't know why, but still have last hope for some miracle, such as out of warranty replacement, or something like that.
Anyone got any ideas what should I do, to save earphones and money spent?
I have exactly the same issue, the left bud will now only last about 45-50 minutes, with the right continuing to work normally. My pair were bought in Feb 2022 so not too happy that £200 headphones will need replacing after just over 2 years. Apparently the issue revolves around Sony making a mess of the batteries that were sourced for these headphones. This link explains the issue in good detail: imgur.com/ASPZwiL
Will be interested to hear what happens if you send them in, and how much they charge you. It should be a free replacement as this is on Sony. They put substandard batteries in what seems to be a random number of units, and then fried them with a firmware update (without testing it against those batteries), which is just incompetence.
Thanks - do you have an email address for the CRO?
If this is indeed a known issue to Sony, then not issuing a product recall, having wilfully distributed a firmware update that fried customer’s products, then gaslighting the affected customers into paying for repairs themselves is pretty disingenuous/fraudulent.
Thank you