There may be a number of reasons... Kindly go through the following Microsoft reference article:
Bluetooth speakers will not stay connected in Windows 11
Dominick_911
0
Reputation points
I have a new desktop computer running Windows 11. I cannot get any of my blue tooth speakers to stay connected. As long as there is audio playing they will stay connected. However once the audio is done playing they will shut off and disconnect after 5 minutes or so.
This never happened under Windows 10. My speakers would stay connected forever unless I manually disconnected them. I have gone to blue tooth settings and made sure to turn off "allow Windows to shut down to save power" but it does not help.