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64-bit Windows 7 "Randomly" Sleeps

Last response: in Windows 7
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September 22, 2012 3:48:57 PM

I've been having issues lately with my computer "randomly" sleeping - I feel, however, that it's not so random.

Currently I'm running an Asus G73JH, Pre-Sandy Bridge i7, 12GB RAM.

The event log entry for the issue is as follows - and the main thing I'm wondering is what "Reason: 4" translates to.

Spoiler
- System

- Provider

[ Name] Microsoft-Windows-Kernel-Power
[ Guid] {331C3B3A-2005-44C2-AC5E-77220C37D6B4}

EventID 42

Version 2

Level 4

Task 64

Opcode 0

Keywords 0x8000000000000004

- TimeCreated

[ SystemTime] 2012-09-22T15:42:13.540703700Z

EventRecordID 109636

Correlation

- Execution

[ ProcessID] 4
[ ThreadID] 56

Channel System

Computer Nautilus

Security


- EventData

TargetState 4
EffectiveState 4
Reason 4
Flags 0


I've most recently noticed this happening while playing Borderlands 2, but there doesn't seem to be a specific trigger during gameplay.

Originally, the computer was hibernating; however, when I disabled hibernation with powercfg, it started going to sleep, instead.

I have my system set to never sleep, never turn the hard disk off, etc. - all the typical fixes using Power Options. The issue, however, continues.
September 23, 2012 4:46:48 AM

What GPU and PSU do you have?
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September 23, 2012 1:54:12 PM

GPU is a Radeon Mobile 5870HD

PSU is ADP-150NB D 19.5V/7.7A (Laptop power supply)
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