Need Help. Lsass.exe uploading at full capacity

[Frank Pirr]

I am desperate as I don't know what to do. lsass.exe is uploading at my full capacity so my internet access is unusable. Checked it via Virus scan and did a sfc /scannow and it came up clean. Cannot stop the service for obvious reasons. What should I look at to fix this issue. Please any help is appreciated. Thank you

OS. Windows Server 2012R2

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