My windows 8 is randomly logging off on its own, bug?

Experiencing the same issue. This happens both on my Laptop (Dell Latitude) and my desktop (Fujitsu Celsius), both Windows 8.1 x64.

The problem only occurs when using a lot of memory, typically 50+ Internet Explorer tabs and/or 50+ Opera tabs along with two or more virtual machines running in VMware Workstation, 20+ cmd consoles, 50+ Windows Explorer windows and so on.

Laptop has 8GB, ws has 16GB of memory.

Also, it seems like Windows 8.1 somehow keeps track of how much unsaved work you have open as it only logs out if you have a lot of it. :-)

Shortly before the logout, the screen flickers as if testing out different display modes. The system then leaves me with the login screen, no questions asked, all applications killed -9.

Application log gets

winlogon event ID 6003,

The winlogon notification subscriber <TrustedInstaller> was unavailable to handle a critical notification event.

winlogon event ID 6003,

The winlogon notification subscriber <SessionEnv> was unavailable to handle a critical notification event.

winlogon event ID 6000,

The winlogon notification subscriber <SessionEnv> was unavailable to handle a notification event.

System log gets

winlogon event ID 7001,

User Logon Notification for Customer Experience Improvement Program

Unfortunately I have not noted the time when the errors occur so I can not say which of the eventlog entries get logged before the logout and which get logged after I log back on.

Regards,

Magnus

"There are even suspicious people who work for Windows and Microsoft in general, so we can never stop to say we are totally perfectly safe. I've had to change my encryption key several times over the course of the last six months because someone from LA cyber squad FBI has been passing themselves off as an A-Class hacker and selling my encryption key/password to other would-be hackers to put a few extra dollars in his own pocket."

...Either you're doing something wrong (leaving a massive security hole), you you are doing something illegal that for some reason has attracted the attention of the FBI. There is no reason they would just, out of boredom hack your encrypted hard drive, and sell your passwords for a few dollars.

In fact, if someone hacked your PC through your web browser (or a hack after you had logged into your computer), you HDD encryption would do  nothing (as it has already been decrypted for that session). The hacker would have access to un-encrypted HDD. Only if somebody physically tried to use your encrypted HDD (maybe using a Linux Live disc, or plugging it in somewhere else) without you entering the password already, would they encounter the encrypted volume. Think about it, all your Windows applications can see the un-encrypted HDD.

"They have the keys to everything and elevated protocols that enable them to do the otherwise impossible."

Correct when you say the impossible (in terms of time). I will agree that some protocols are broken, and we all have heard about the NSA revelations (confirming the fears that many already had). But many open source projects are audited for weaknesses in their cryptographic code and they are fine. TrueCrypt many consider to 

Another thing here, I don't understand why you find it needed to reinstall your PC every month or so? Surely your PC isn't infected every month!? If it is, you really are doing something stupid.

Changing your IP is not the worst advice, though if you have a hardware firewall at your gateway (on your router) and it has no open ports, then they can't really do anything with your IP anyway (apart from DoS).

Most of your advice is tin-foil hat advice. Telling people not to use the internet, or at least minimise their exposure!? For most users (and the audience of Microsoft Answers) you advice is not great - or even related to the issue here.

Not a chance. My computer is extremely secure and just in case I of course did all that way before I ever came here.

Almost a year ago with a brand new PC did I have the same problem. I followed every suggestion that was made on this site with no change. The best advice I got was to go back to Windows 7. I did that and never had another problem. There is some problem with Windows 8 that logs people off on a random basis for whatever reason but it is a quirk of Windows 8 that MS needs to figure out.