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#1
Did you just click on Shutdown in the start menu ?
In Windows 8/8.1/10 that actually put's your pc in hybrid-sleep and it probably wakes up for updates.
To actually shutdown Windows 8/8.1/10, you need to click on Restart and then at the login screen, click on the power icon at the lower right corner and click on shutdown.
That's the only way Windows 8/8.1/10 actually shut's down your pc/laptop/ultra-portable/tablet.
Yeah, it's dumb that Microsoft didn't let it's customers know that one.
I only found about it through a computer magazine website back after I had upgraded to Windows 8 in 2012.
There's also a ssd speedup trick since Windows 8 that slightly sppeds up bootup times.
For that one you just restart your pc 8 times and don't login until after the 8th restart.
Another tip they didn't provide to their customers.
Again a computer magazine website posted it and from personal experience it works and decreases bootup/startup times by 2-5 seconds.
Pressing the Shift key and clicking Shutdown tells the PC to do a full shutdown rather than a hybrid shutdown.
Jim