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I can't recreate this with a Z5 and Z5 Premium, you could repair the phone with PCC
Bridge (for Mac)
Alternatives on How to backup Xperias
could u do a screen record in your Xperia Z5 and play music at full volume and toggle clear audio+ on and off so I can see how it should actually Work? Thanks
You have to contact your Local support since most likely there's something wrong with your device, if you bought this phone new and you never unlocked the bootloader nor rooted the phone, then let them inspect it