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Please try to disable Wake-on-LAN option in your operating system.
Access the following link to see the instructions step by step Wake-on-LAN behavior in Windows 8
Thank you for your advice. But after reading the article, I do not think it can solve my problem.
My windows 8 system goes to sleep in S4 mode now.
If i disable "Fast Startup" as instructions, it goes to sleep in S3 mode insteadly.
" As a result, Wake-On-LAN is only supported from sleep (S3) or hibernate (S4) in Windows 8." ( Quotation )
So the random waking up will still happen.
I found while "Deep Sleep" in enabled in bios, "Wake on LAN from S4/S5" is set to "Stay Off" automatically, and I can't modified this option.
This issue is not always happening, but I can't find the regular pattern.
I put my PC in bedroom, and I can't go to sleep while it is power on, this is really annoyed me.
If you disabled the "Deep sleep S4/S5" on the BIOS, you should be able to change the settings on the "Wake on LAN from S4/S5".
However, you should also check the settings of your network adapter, on the Device Manager.
Network adapter>properties>power management. Uncheck all wake on LAN options.