"Unexpected shutdown" error in system log after coming back from sleep

Dell Studio 1558, Win 7 Pro X64. Start > Sleep. Press power button to come out of sleep. 3 out of the last 5 times the laptop comes back with a message that Windows was not shut down properly etc. I looked in the System events log and found that every time I put the computer to sleep an error message is logged when I have the computer come back from it (even in the cases where there is no message on the screen stating that Windows was not shut down properly). The error message in the System log is the usual "The last shutdown at (time/date) was unexpected".

Any ideas/suggestions?
RHE13Asked:
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JohnConnect With a Mentor Business Consultant (Owner)Commented:
Try updating the Windows Power Driver (See Device Manager, System Devices). Also try updating the Dell Power Manager application (I assume there is one).

Then update BIOS, Chipset (and in the case of Dell) Video as well.

Update all of the above and test manual suspend with the lid open. Does it now suspend without error.

.... Thinkpads_User
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RHE13Author Commented:
Thanks, I updated BIOS and Chipset. Wasn't able to reproduce the problem after that. I'm waiting a couple of days to make sure it doesn't happen again and then will report results.
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JohnBusiness Consultant (Owner)Commented:
Thanks for the update. Please let us know when you have confirmed.

.... Thinkpads_User
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RHE13Author Commented:
I watched the logs and it looks like it happened again, once. However not conclusive whether that error was related to the same problem, and it only happened once whereas it was happening continuously. I'm letting 2 or 3 more days go by and I'll check even logs again then.
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RHE13Author Commented:
Inspected logs again and it hasn't happened again, so updating BIOS and/or Chipset must have done it. Thanks.
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JohnBusiness Consultant (Owner)Commented:
@RHE13 - Thanks for the update and I was happy to help.

.... Thinkpads_User
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