The issue is that the Origin Client web renderer is holding open an audio stream, for some reason. Quitting the client clears this and sleep/hibernate can proceed as usual.
PS C:\WINDOWS\system32> powercfg -requests
[DRIVER] Realtek High Definition Audio (HDAUDIO\FUNC_01&VEN_10EC&DEV_0900&SUBSYS_1458A0B2&REV_1000\4&1c3e785f&0&0001)
An audio stream is currently in use.
Glad to see we're almost two years in and this is STILL AN ISSUE.
Here's the MSDN docs on power management under windows. Maybe get an intern to fix your broken garbage?