system shutdown

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I have a user that is getting a message stating

This system is shutting down. Please save all work in progress and log off.
Any unsaved changes will be lsot. This shut down was initiated by
domain\user.

Message
Critical system error. Process: lsass.exe, module: kernel321.dll at address
0x78221981. Instruction is referenced memory at 0x00000000. Null pointer
exception.

This will pop up at different times during the day and this morning it would
pop up first thing when his system was turned on and he logged in. Any help
is appreciated.
.

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