Disable log-off while account is locked.

What I meant was that there are no restarts/shutdowns, but only automatic logoffs 2 hours after disconnecting from the remote desktop (on the computer, which I was connected to). That's all what happens.

Tried everything You proposed, but nothing helped. I'm still getting signed out. All I found is something in policies called "Force logoff when logon hours expire", but it also didn't help. Same with disabling scheduled tasks/going into safe mode.

Yay! Found it in registry!
In:

Code:

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services

there is "MaxDisconnectionTime", which was set to 7200000 (2 hours in ms). After changing it to 0 and restarting the computer it fixed my problem. The computer doesn't log me off anymore.