Windows 7 hanging at shutdown

We have been battling an issue with a client for about 4 months now. PCs are randomly getting hung on shutdown at different points in the week with no rhyme or reason. We have scoured the event log and can see nothing that would cause this. We cant recreate the issue because if on those same PCs we can reboot and itll reboot as normal. Also at random times during the day users will be unable to browse the C: or mapped drives without manually putting in the directory (ie C:\windows\) Any direction on what we could use/logsto see what is causing the shutdown hangs and random slow browsing folders?
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John TsioumprisSoftware & Systems EngineerCommented:
If it was 1 or 2 PC this would point to faulty memory dims.....but i think we are talking to more than 1 or 2...can you give more info?
Member_2_4858494Author Commented:
Client has almost 300pcs....started back middle of november with a few PCs now close to 50+ PCs with the issue
Member_2_4858494Author Commented:
We have confirmed all patching is up to date. AV solution is Symantec Cloud along side Malwarebytes which we have used for sometime with no issues.
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John TsioumprisSoftware & Systems EngineerCommented:
I will say something crazy but it can about a faulty switch/NIC flooding the network with packets causing real havoc....i had an issue some years ago with a problematic switch/NIC....(i changed several at once so i can't clearly isolate the cause)....its a long shot but given the fact that you have an unresovable issue maybe you should look for common denominators....
dbruntonQuid, Me Anxius Sum?  Illegitimi non carborundum.Commented:
PCs or users that are getting affected?

I mean if a user is getting affected and that user moves to another computer known to be OK does the user still get affected?
Edward PamiasTeam Lead RRS DeskCommented:
I would try this on one of the machines as a test.

    Press Windows Key + R, this will open run prompt, type regedit and press enter.
    This will open registry editor, browse to the following key : \HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management
    Click on the value ClearPageFileAtShutdown and change its value to 0
RaminTechnical AdvisorCommented:
Disable the realtime protection for Symantec and retest.
Natty GregIn Theory (IT)Commented:
How long are these work stations in service, it could be that the drives are failing.
David Johnson, CD, MVPRetiredCommented:
are you using roaming profiles?
Member_2_4858494Author Commented:
Looks like we have found the issue. At that client we had Malwarebytes/Symantec running side by side to enhance the AV coverage. Through Symantec support we found that the latest update to the engine was not compatible with Malwarebytes. We were able to exclude both folders with each software to remedy the issue. Thanks to all who contributed to help find the solution!

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Member_2_4858494Author Commented:
Fixed issue
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Windows 7

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