1
Diagnostic step 1
Reproduce with minimal setup: disconnect all other devices from the dock, use a different high-quality USB‑C cable (with ferrite beads if available), and test again to see if dropouts persist.
FULL AI ANALYSIS
Bluetooth headset audio stutters only while MacBook is charging through the same USB‑C port/hub
Generated Oct 3, 2026, 12:35:03 AM
Analysis summary
When Bluetooth works normally except under specific charging/hub configurations, common causes are electromagnetic interference (EMI) from the charger/cable/hub, shared antenna routing/grounding issues on the charging port, or the dock influencing the USB host controller (e.g., negotiation or leaving USB lines in a state that impacts Bluetooth coexistence). The fact that using a different charger or port resolves the issue points away from the headset or macOS alone and toward the physical charger/hub/port combination.
Possible causes
EMI from the third-party charger or cable coupling into Bluetooth radio leading to packet loss
85%Grounding or shielding problem on the dock that interferes with Bluetooth antenna performance when connected to that port
80%Hardware-specific port routing or USB controller implementation causing reduced BT coexistence when dock is attached to that specific Thunderbolt port
55%Dock/charger negotiating USB Power Delivery or alternate modes in a way that briefly impacts the USB controller or BT coexistence logic
35%Suggested fixes
2
Diagnostic step 2
Test the same dock+charger combination on another Mac (if available) to determine whether issue is dock-specific or Mac-specific.
3
Diagnostic step 3
Use the Mac while charging on a different port or directly to Apple charger as a workaround; if that consistently avoids the issue, avoid the problematic port/dock combination.
4
Diagnostic step 4
Collect Bluetooth HCI logs while reproducing (in Console > Bluetooth or using 'log stream' and bluetoothd diagnostics) and record timestamps; if EMI is suspected, try moving the dock/charger away from the Mac and test with different AC outlets (to rule out grounding issues).
5
Diagnostic step 5
If the problem persists after these steps, open a ticket with the dock vendor (provide logs and reproduction steps) and with Apple Support if hardware troubleshooting indicates a potential port routing or antenna fault; escalate to vendor/hardware support with captured logs and detailed test results.