1. HWE kernel with updated drivers:
Since your hardware is quite recent I recommend installing HWE kernels. They have more updated drivers. `sudo apt install --install-recommends linux-generic-hwe-20.04.
2. Disabling fastboot if you dualboot with windows
You need to go to your Windows system and then “Control Panel→Hardware and Sound→Power Options→System Settings”. Select “Chooose what the power buttons do” to access the System Settings from the Power Options. Then disable the “Fast Startup” option in “Shutdown Settings”. This will cause Windows to fully shutdown and may solve the issue.
3. Restarting the module
sudo rmmod btusb && sudo modprobe btusb. If after a reboot the bluetooth module stops working again, it is necessary to enable the systemd service.