Looking for help, PC Waking/(re)Booting on it's own.

[Commodore Sim]

Hey all, I'm looking for troubleshooting a very curious issue. 

I'm running a desktop PC Windows 10, sometimes I can't put my machine into sleep mode, and worse sometimes this persists so far as I can't get it to stay turned off. 

 

Here's what happens:  I tell the system to enter sleep mode and it will do so, system appears to be fully dormant.  No fans, no lights, no USB signals, no video signal; for about 5 seconds. It then wakes all on it's own with no user input. like a normal wake up process.  Worse still often if I then attempt to do a Shut Down from windows it will do the same exact thing only now it's a full boot, again with a few seconds of apparent dormancy.  My only solution is a power button forced shutdown.

 

It doesn't always happen, maybe 25% of the time.  There seems to be some correlation with which task it do beforehand but I don't know which.  I suspect it might somehow be a wake on LAN signal, the UEFI isn't the greatest but I think I have Wake On LAN turned off too.

 

Any advice? Anywhere I can search for the trigger?

 

Mobo is Gigabyte Gaming 3 Z170 chipset

[HanZie82]

Press WINKEY+R ^{(to run something)} then type CMD ^{(to open a command prompt)}.

In that command prompt type:

powercfg /waketimers

 

Then check that list if you see anything that doesn't belong.
(Or post a screenshot here if you don't know).

[Commodore Sim]

14 minutes ago, HanZie82 said:

Press WINKEY+R ^{(to run something)} then type CMD ^{(to open a command prompt)}.

In that command prompt type:

powercfg /waketimers

 

Then check that list if you see anything that doesn't belong.
(Or post a screenshot here if you don't know).

"There are no active wake timers in the system."

[homeap5]