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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 Tsioumpris
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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?
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Client has almost 300pcs....started back middle of november with a few PCs now close to 50+ PCs with the issue
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.
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....
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?
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
Disable the realtime protection for Symantec and retest.
How long are these work stations in service, it could be that the drives are failing.
are you using roaming profiles?
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