I am assuming here that both the devices are paired. You can confirm that by going to Settings > Devices > Bluetooth. You can then follow the tips mentioned below if the Bluetooth speaker is connected ...

As fun as it is to blast your favorite songs (or Netflix shows) from your PC speakers, it's generally a no-no for those of us who live with others. That's where a good pair of Bluetooth headphones ...

As painful as it might look, updating or reinstalling Bluetooth drivers is the most recommended way to fix the frequent disconnection issue. Look for Bluetooth Power Management settings under Device ...