Windows 11, Phone paired and connects for a few seconds before disconnecting again.

Device: Acer Predator Helios Neo 16 PHN16-72

Issue:
Bluetooth was working fine for the first week after setup, but it now fails to stay connected with any smartphone. I need Bluetooth for features like Dynamic Lock.

When connecting from the laptop to a phone, the connection briefly succeeds and then disconnects.
When connecting from the phone to the laptop, the phone says: "Can't connect to [device name]".

Troubleshooting steps already attempted:

Uninstalled all Bluetooth drivers using Device Manager and reinstalled the latest from Acer’s support site

Unpaired and restarted both laptop and phone before trying again

Removed old ibtusb driver files using pnputil /enum-drivers

Ran the Bluetooth Troubleshooter in Windows Settings

Installed all available Windows Updates

Disabled Fast Startup in Power Options

Checked that Bluetooth services are running in services.msc

Tried multiple phones to confirm it’s not a device-specific issue

Used Intel Driver & Support Assistant to check for missing drivers (none found)

Temporarily disabled antivirus to check for software interference

Would appreciate any guidance or additional steps I can try to fully resolve this. Thanks in advance.