Windows 10 clients suddenly booting after shut down

Very great cheerings to all of you guys
Nice to talking you
Hope you all are fine,

Pretty much all of our Windows 10 machines (1809) have started to boot up again soon after you shut them down.
Fast boot is disabled, they shut down cleanly, Windows updates are not causing it. The only thing I can think of is something is telling them to boot over the Lan somewhere (WOL) but I don’t know what… I can unplug the Ethernet cable and the machine will stay off, so something is linked to that.
We have a product called desktop Central installed on all clients so they can all be controlled centrally but there are no schedules I can see that are enabled which would cause this. Is there a way to check what initiated the bootup? I tried some commands but it didn’t show anything.
Much needed help for me to resolve the problem.