Spontaneous transition to standby mode, Win 8.1 - how to fix it?

Question

Windows

There was such a problem. The laptop, regardless of the power settings, goes into standby mode (falls asleep). In the power saving settings, I put down "never" everywhere, but the laptop still falls asleep. I checked the screen saver settings, it is also disabled.
There is such a feature, such a failure occurs only after the first manual transfer to standby mode. That is, if you restart the laptop and do not put it into standby mode, then it works fine, does not fall asleep, but if you manually send it to sleep once, then after waking up, it will randomly go to sleep.
I go to the kitchen for a cup of tea while I go, he manages to fall asleep, he was tormented by 5 minutes of PC downtime to enter passwords to enter the system.
Where to dig, what to do?

Answer 1

1. What are the reasons for switching to standby mode in the system log at the time of transition (Kernel-Power and Power-Troubleshooter events).
2. Standby = sleep? Hibernation is not used?
3. Are you sure auto-suspend is disabled on all power plans? Post a file with the results of the command "powercfg -q > res.txt" after reboot and "powercfg -q > res_asl.txt" after "manually send to sleep once, then after waking up he himself".
4. Power management programs from the laptop manufacturer (or self-installed) are not used?
5. Are the drivers from the manufacturer all the latest ones?