Fedora 33 how to disable automatic updates

I recently updated to fedora 33 and now the system has a very very ugly behavior:

From time to time I am not able to switch the system off. Instead it is doing “something during the shutdown”. By restarting, it boots to an update mode and shutdowns again. I have no control about all that ugly things.

I want to do updates as needed with the good old “sudo dnf update” if I like and not to get any broken package as someone else means. Especially the multiple boot/reboot/shutdown feels like windows.

Q: How to disable automatic updates and get back update control.