Since I was the victim of this issue because of my sound device, I will keep it to fixing the issue with audio device. But these steps can also be used for other devices like ethernet card etc. These may not all be the reasons in your case. You may try the solutions one by one and check if your problem is fixed.
Power Management using command line Disable Cortana Check Power Options for sleep option adjustment
Power Management using command line
Disable Cortana
Windows 10 have Cortana option that allows you to speak and Cortana will open it for you by listening what you speak. If the issue occurs after updating your Operating System to Windows 10, then it might be Cortana that is creating trouble and won’t let your system sleep.
Check Power Options for sleep option adjustment
The solutions are tested and verified. Hopefully, you will be able to disable audio stream which is creating an issue for a system while going to sleep mode. Thank you.
