Host System is performing a LPC reset

Hello,

        I have almost new Dell PowerEdge R320. From time to time we get restart:

• 2013-03-24T10:08:21Z    NIC101 The NIC Slot 1 Port 2 network link is up.
• 2013-03-24T10:08:20Z    NIC101 The NIC Embedded 1 Port 2 network link is up.
• 2013-03-24T10:08:20Z    NIC101 The NIC Embedded 1 Port 1 network link is up.
• 2013-03-24T11:07:38Z    SYS1003 Host System is performing a LPC reset

It's streange but we didn't touch netowrk , so "link up" messages are streange.  Server make self restart at 11:07. Why it's happen ? OS: Centos 6.4

Thanks

Pawel Rutkowski