Windows 8.1 unresponsive with system process at 25% CPU

I have a Toshiba L50-A with an Intel i5-4200U CPU running Windows 8.1 with all current updates installed. At random times (varying from 1 to 15 days but averaging once every 3 days) the "System" process begins using approximately 25% of my
CPU with the usage spread across the 4 logical processors. Using Sysinternals Process Explorer I can see that the thread using the CPU is "ntoskrnl.exe!ExfAcquirePushLockExclusive+0xb54". Once this starts running, tasks (like Process
Explorer) continue to run but I cannot initiate any new task (like Xperf) and can sometimes shut down tasks until the system finally locks up completely. I can find no way to interrupt this condition and have to hard power down the system. I
have investigated all the drivers associated with my peripherals and believe they are up to date. I have also run a severe CPU and Memory test tool for 24 hours and found no issues. I cannot identify anything which changed in my system which
triggered this but when it first manifested it sometimes went 10 or 15 days between occurrences so it could have been a fix or driver but I cannot identify that connection. Can anyone give me an idea of how to investigate this further or what steps I
can take to provide more pertinent data?
Thanks,
Keith

Hi Ckeithh,
Did this issue occur recently ,Have you installed any software recently?
To analyze this issue ,I recommend you to work with the Windows Performance Toolkit. It is included in the Windows Acccessment and Deployment Kit.
Here is a link for downloading the tool
WPT: WPR/Xperf: Capture high cpu, disk i/o, file, registry, networking, Private bytes, Virtual bytes, Paged Pool/Nonpaged pool and/or application slowness
http://blogs.technet.com/b/yongrhee/archive/2012/11/23/wpr-xperf-capture-high-cpu-disk-i-o-file-registry-networking-private-bytes-virtual-bytes-paged-pool-nonpaged-pool-and-or-application-slowness.aspx
I recommend you to try this tool to capture the process ,if you have troubles in analyzing this . Please upload the files you captured to the Onedrive and paste the link here.If this tool can`t be performed, please post back.
Meanwhile, I recommend to get into safe mode to work with the predefined drivers and services to have a analysis.
As for the "ntoskrnl.exe!ExfAcquirePushLockExclusive+0xb54",here is a link for reference:
Push Locks – What are they?
http://blogs.msdn.com/b/ntdebugging/archive/2009/09/02/push-locks-what-are-they.aspx
Best regards

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<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
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P2: 6.1.7601.22653
P3: 534893ed
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C:\Windows\Temp\WER5001.tmp.appcompat.txt
C:\Windows\Temp\WER535C.tmp.WERInternalMetadata.xml
C:\Windows\Temp\WER53DA.tmp.hdmp
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<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
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C:\Windows\Temp\WER535C.tmp.WERInternalMetadata.xml
C:\Windows\Temp\WER53DA.tmp.hdmp
C:\Windows\Temp\WER6690.tmp.mdmp</Data>
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Event ID:      1001
Task Category: None
Level:         Information
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User:          N/A
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P1: lsass.exe
P2: 6.1.7601.22653
P3: 534893ed
P4: msvcrt.dll
P5: 7.0.7601.17744
P6: 4eeb033f
P7: c0000005
P8: 0000000000001111
P9:
P10:
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C:\Windows\Temp\WER5001.tmp.appcompat.txt
C:\Windows\Temp\WER535C.tmp.WERInternalMetadata.xml
C:\Windows\Temp\WER53DA.tmp.hdmp
C:\Windows\Temp\WER6690.tmp.mdmp
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C:\ProgramData\Microsoft\Windows\WER\ReportQueue\AppCrash_lsass.exe_3c1aa5eeba75bf26fcebc4f54e714efe7b5162a2_cab_20a56871
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Report Status: 4
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<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
    <Provider Name="Windows Error Reporting" />
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    <Data>0</Data>
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    <Data>msvcrt.dll</Data>
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C:\Windows\Temp\WER535C.tmp.WERInternalMetadata.xml
C:\Windows\Temp\WER53DA.tmp.hdmp
C:\Windows\Temp\WER6690.tmp.mdmp</Data>
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    <Data>4</Data>
</EventData>
</Event>
Would really appreciate if someone can point us to the correct direction on how to get this issue sorted.
Regards,
Dhanushka

Hi Sir,
Please try the following items:
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https://social.technet.microsoft.com/Forums/windows/en-US/bf69eeff-24c4-499f-b280-b6a3098f4f9f/problem-with-msvcrtdll-version-70760117744?forum=w7itprogeneral
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