Meta AI voice severely stutters when iPhone is locked / Meta AI app is in background

I am experiencing a reproducible issue with Meta AI voice playback on my Meta AI glasses.

When my iPhone is locked or the Meta AI app is running in the background, Meta AI's voice severely stutters and becomes difficult to understand.

Symptoms:

- Meta AI voice responses and spoken message/notification announcements frequently stutter.

- Instead of speaking a sentence normally, the audio sounds fragmented, for example: “Th…e… me…ssa…ge… is…”

- Music playback through the glasses works perfectly without any stuttering.

- Regular Bluetooth audio appears to work normally.

- As soon as I unlock my iPhone and bring the Meta AI app to the foreground, the stuttering immediately disappears.

-Meta AI voice then plays smoothly and normally.

-The roblem may return after the phone is locked and the Meta AI app goes back into the background.

Steps to reproduce:

1. Connect the Meta AI glasses to an iPhone.

2. Leave the Meta AI app in the background.

3. Lock the iPhone.

4. Trigger a Meta AI voice response or a spoken message/notification.

5. Meta AI voice playback severely stutters.

6. Unlock the iPhone.

7. Open the Meta AI app and keep it in the foreground.

8. Trigger another Meta AI voice response.

9. Voice playback immediately becomes smooth and normal.

Meta AI voice severely stutters while the app is in the background, but immediately returns to normal when the Meta AI app is brought to the foreground.

Environment:

Glasses: Meta AI glasses (Adventurer)

Glasses firmware: v129

Phone: iPhone 16 Pro

iOS version: 27

Meta AI language: Korean