Win 8 PC closes windows user session randomly (not in a domain)

Win 8 PC closes windows user session randomly (not in a domain), 2 times per day as an average.

I checked the windows app and system logs, but I don´t find some entry that may clarify what the problem is.

I am suspicious about maybe Skype, so I have just disabled the SkypeUpdate service and stopped the Skype process to test.

Is there some way in which I can enable some level of logging for this event that might throw more info? (if it happens again, I would like to know which process is doing so and why)
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pablovrAsked:
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pablovrAuthor Commented:
I have more clues about this problem...
The user is telling me that it happens sometimes when using IE, and checking the sys logs, I see some problem reading the hard disk. So, tomorrow afternoon I will pick up the PC and use Checkdisk, and disable IE addons to see if it helps.
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pablovrAuthor Commented:
And... check for virus
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rindiCommented:
Before running chkdsk, use the disk manufacturer's diagnostic utility to test it. Chkdsk only checks and fixes file-system corruptions, not the disk itself. You'll find the diags on the UBCD:

http://ultimatebootcd.com

Also run memtest86+ (also on that CD).
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pablovrAuthor Commented:
Thank you rindi, I have just managed to solve the problem with checkdsk /r

It is a good idea as you said to run the disk manufacturer´s diagnostic utility first, though this computer is an old one and it has no brand (custom made), so I went directly to the checkdsk approach.

I tried as well running memtest86+, there were no issues with RAM.

Problem was some damaged sectors affecting the OS, so far it looks good.
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rindiCommented:
I wasn't talking about the computer's brand, but rather the HD's brand (Western Digital, Seagate, Samsung etc).
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