I've been using Ubuntu 20.04 for several months now and have noted that my Bluetooth mouse and keyboard will randomly stop connecting several times a day. When I go to Settings -> Bluetooth, they still show up as connected but are clearly not. Sometimes I'm able to "fix" the problem by shutting off Bluetooth, turning it back on and then reconnecting the devices, but more often than not, it requires a reboot, which is extremely inconvenient, and - dare I say it - "Windows-like". I am running the 5.4.0-48-generic kernel on a year-old Dell XPS 13.