Official Apple document
https://support.apple.com/en-us/HT201542
Recommendations
- Open System Preferences > Bluetooth
- Check the “Show Bluetooth in menu bar” box
- Shift + Option + Left click on the Bluetooth icon in the menu bar > Debug > Reset Bluetooth Module
- System Preferences > Bluetooth > Remove troublesome bluetooth device and reconnect it
- If you are still having issues, open the Self Service application on your mac and use the Fix Bluetooth option.
NOTE: The Fix Bluetooth option will reset all bluetooth devices and reboot your computer. Keep in mind that your bluetooth keyboard and mouse will need to be synced by connecting them to your computer via cable or using a wired input device to go through setup.
Other things to try
Lookup how to factory reset your bluetooth device
SMC Reset:
https://support.apple.com/en-us/HT201295
NVRAM/PRAM Reset:
https://support.apple.com/en-us/HT204063
Set your AirDrop setting to “No One”
System Preferences > General > Disable “Allow Handoff…”
Boot your mac into safe mode by booting while holding down the shift key, then reboot again. Safe mode clears certain system caches.
Sign out of your iCloud account, reboot, sign back in if necessary.
If you made it this far, you may be in for a new device or an appointment with Apple. Sorry.