How to find out what keeps the laptop from sleeping?

Question

Windows

Win10x64_1607LTSB
problem: prevents sending PC to sleep after connecting another computer to laptop (shared access)

spoiler

SYSTEM:
[DRIVER] \FileSystem\srvnet
An active remote client has recently sent requests to this computer.

Have to reboot for this problem to disappear
Settings in pictures

spoiler

Network settings, services, etc. everything is identical to other PCs at home.
Only those fall asleep, but for some reason this one does not.
What program can you see what kind of animal is hiding?
As a last resort, will this solve the problem?

spoiler

powercfg /requestsoverride DRIVER "\FileSystem\srvnet" SYSTEM

Correct if wrong