T500 - Random Shut Down After Screen Unlock

Hi,  I have a T500 notebook and when I am away from my desk I lock the screen.  Randomly when I come back to my desk and unlock the computer it will shut itself down about 5 seconds after I unlock the screen.
This is now a daily occurance.
I am running Windows XP Professional SP3 with all updates from the windows update website applied.  I also have all the updated drivers and utilities from the Lenovo website.  I have read a number of other threads which mention video drivers when playing games, but I am not doing any gaming.  This is a work notebook and so I am primarily running outlook and other office applications when the shutdown occurs.
This is really annoying and if anyone has any ideas it would be greatly appreciated.
Thanks.

Hello!
We get the same Error ("saving your settings") on 20-30 T400 in our Company. We have a open call by LENOVO AUSTRIA. The Technical Engineer from Lenovo has send one referenz Notebook in the LABs to LENOVO International.
We use: Windows XP SP3, Engery Manager, Ultra Nav, Access Connections 5.02.
Newest Drivers, Firmware, BIOS and patches doesn´t help. We has got the error yesterday in the meeting with the LENOVO Technical Engineer with our Image and the newest driver and Firmeware.
We think that the following points can be excluded:
- Intel AMT (deaktivated in the BIOS)
- Akku (Also happend with other Akkus)
- Powersupply (Also happend with differrent Power supplys)
- RJ45 Network Card
- WLAN/Bluetooth/WWAN (Also happend with deaktivatet WLAN - Hardware switch)
Can anybody send me an Windows Eventlog? We could check the eventlogs if we have something in common.
We have turned on the Window extendet Process informations (local group policy) and can find the point where the laptop starts the logoff. But we can´t find the reason. If the PC hangs, the client is reachable per remote and all System Process are correctly runnig. All user tasks an processes are killed. Only the userlogon.exe is running, but no user processes. 
Today, i have uninstalled the Power Manager on 6 Notebooks and wait whats happend. The main problem is, that the error occours on ramdom times and without a known reason. We cant readjust the error ;(
Did anyone use McAfee Host Intrusion Pretention ? What configuration and Sofware are you using? Did anyone get this error with Windows Vista?
Thanks for reply!
Roland
Message Edited by rolysbg2 on 03-05-2009 02:46 PM

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