I am running 18.04 updated. One of the post 20.04 updates broke the bluetooth mouse. It works fine after a reboot. Once the system goes idle (the slideshow screensaver runs) the mouse is disconnected. The applet shows the mouse to be still connected and working normally, but it does not work.
(Linux has now become what the old Windows used to be. Something or other is always breaking. The process of continuous updating invents new annoyances. Not all the time, but quite regularly. Samba works well, so i use it as a file server.)