Hi there. I've been having this problem since I built this system.
You can view the full specs from here. I'm using Windows 10 Pro x64. I also have AI Suite 3 installed (latest version with the latest patch for my motherboard -Z170 Pro Gaming-). So here is the situation..
To test, I disabled display turn off timer and told the computer to go to sleep after 1 minute (from windows settings). After 1 minute, literally nothing happens. I usually use display turn off timer too (I just disabled to test the sleep timer) and when I tell the displays go to sleep (let's say after a minute again) this happens. Display turns off, then it goes back on after a few seconds for no reason. No inputs, no nothing. It just turns back on as if something is preventing it.
I then started going through AI Suite's EPU settings. Checked "away mode", (my system is set to performance mode since it's overclocked but I tried balanced and away mode, the result is the same) I set display timer to 5 minute and sleep timer to 10. 5 minutes later, same thing happens with the display and after 10 minutes, system just keeps idling instead of going to sleep. I then decided to check the sleep timers with the "powercfg /waketimers" command but nothing shows up there.
What can I do here? I'm thinking of uninstalling AI Suite, see if it's causing the issue but I remember doing that in the past (for a different reason) and I had to go through some issues. So I'm a bit hesitant to uninstall it again. I also have several programs installed which may prevent sleeping (like Plex media server) but for the sake of testing, I closed those kinds of programs and it still didn't go to sleep.
I don't know what to do here. Any help would be greatly appreciated.