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Windows 7: Windows 7 suddenly and unexpectedly goes into sleep mode

19 Aug 2012   #1

Windows 7 Ultimate x32
Windows 7 suddenly and unexpectedly goes into sleep mode

I am using a Lenovo Thinkpad running Windows 7 Ultimate x32 to operate an astronomical observatory. This requires running a range of software simultaneously. On several occassions, my computer has gone into sleep mode and will not respond to waking requiring a hard shutdown and reboot. This introduces a host of registry errors and stops any astrophotography. I have looked into Event Viewer and all I get is the following entry:

The system is entering sleep.
Sleep Reason: Application API

Why is this happening? What can I do about it?

My System SpecsSystem Spec
19 Aug 2012   #2

Windows 7 Ultimate x32

I can add that the cause appears to be "Event 42, Kernel-Power".
My System SpecsSystem Spec

 Windows 7 suddenly and unexpectedly goes into sleep mode

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