check the firmware and other settings on your router , i know somebody who had this problem and it turned out that when the router got an update it would trigger the pc to turn itself on even though it was actually off. i was a long time ago so i cant remember what the exact solution was but maybe your isp could help you.
Apologies if I'm getting this completely wrong but the restart function is meant to completely shutdown the pc, so having the pc completely off (as if there is no power) is a normal restart, it then boots the pc as if you pushed the power button.
choosing Restart from the UI will do a full shutdown, followed by a cold boot
A cold boot is a boot from the computer completely off, i.e the pc fully shut down, no power being drawn.
If your pc wasn't doing this before then I would say that it was broken and is now fixed.
If I am misunderstanding then please try and explain in detail what the issue is, do you have to turn it back on again because it's not doing it itself? Is it not turning on unless you reset the power switch on the psu?
the restart happens exactly like what you described which you say it is normal.i am working with several other builds which they are not like this at all are they broken too? also it doesnt happens to all restarts it happen sometimes, about 4 of 10 restarts.now some details about this restart: shutdown of this resttart is not like a normal shutdown in normal shutdown when you press shutdown in ui a screen will appear with shutdown written in middle then after some time pc shutsdown but in this shutdown when i press restart it shutsdown like when power of home is lost is this normal?also after this kind of shutdown when when i go in eventviewer each times it shows critical error kernel power event id 41 error