Automatic restart

[micky1500]

5.20.0 is about 5 years old. My Version is only 3 years old !
Run an update then try the re-install to force an update of Monit.
sudo apt-get update
sudo apt-get upgrade

Or uninstall it completely, then reinstall the latest version.

https://mmonit.com/monit/changes/
https://lindevs.com/install-monit-on-raspberry-pi/