Meta AI Korean voice severely stutters when iPhone is locked, but English works normally

Hi,

I'm using Ray-Ban Meta Gen 3 with an iPhone, and I'm having a severe issue with Meta AI voice responses in Korean.

The issue is very easy to reproduce:

• Meta AI language set to Korean
• Meta AI app open in the foreground -> voice responses are completely normal
• iPhone screen locked / Meta AI app in the background -> Meta AI voice becomes extremely choppy, stutters, and sounds like it is constantly buffering
• Meta AI language changed to English -> voice responses are normal even when the iPhone is locked
• Music, Bluetooth audio, and the glasses' speakers work normally

I have already checked:

• Background App Refresh is enabled
• Low Power Mode is disabled
• Low Data Mode is disabled
• Meta AI app is left running in the background

So this does not seem to be a hardware or speaker issue.

It appears to be specifically related to Korean Meta AI voice/TTS when the Meta AI app is running in the background or when the iPhone is locked.

Other Korean users seem to be reporting similar symptoms as well.

Is Meta aware of this issue? Is there currently any workaround or planned software/firmware fix?

Thanks.