Greetings!
This is Tin, may I know when did the issue start? Is there any changes made before you got this issue? Please send the make and model of your device. (Please press Windows key + R and type msinfo32 and hit enter, look for system model)
Have you tried to restart your computer already? If not yet, please restart first before trying to reconnect it.
If the issue persists, please run the Troubleshooter, please open Settings, then System, choose Troubleshoot. Click Other troubleshooters and click Bluetooth option and Run it.
Please let me know how it goes.
Thanks,
Tin