Hi DominicFitches,
Thank you for reaching out Microsoft Community. We apologize for the inconvenience this may have caused.
By the way, is your Surface device up-to-date? To initially troubleshoot this issue, kindly follow the steps below.
1st Step: Check for Windows Update to ensure there are no missed updates
- Go to Settings > Update & Security > Windows Update > Check for Updates and click Install.
- Once done, please restart your device to apply the updates.
- Run **Surface Diagnostic Toolkit** and make sure to complete the tasks.
2nd Step : Uninstall/Reinstall Bluetooth Driver
- Open Device Manager
- Expand Bluetooth
- Right-click on Marvell AVASTAR Bluetooth Radio Adapter and click " Uninstall Device". If a pop-up shows up, leave the box uncheck, just proceed uninstalling the driver and restart your Surface to get the driver reinstalled.
3rd Step : Download Drivers and Firmware
- Go to Download Drivers and Firmware. Choose Surface Pro 6 and hit Download. Select the .msi file that matches with your device OS Build or the closest one available, hit Next and click Run and download it successfully. Once done, you restart the device to apply the changes.
- To check your device current OS Build: Go to Settings > System > About and see Windows Specification for details.
Once you restarted the device, unpair and re-pair the Bluetooth headphone and see if this works perfectly.
If this helps, please let our Community know by marking this post as an answer. Otherwise, don't hesitate to respond to this thread for assistance.
Kind Regards,
Crest_Z