The ESXi host suddenly restarts

THe ESXi 5 host sometimes suddenly restart. I have hosts. The other one is working fine. Could you please assist me with this issue?
Thanks,
dongocdungAsked:
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dongocdungConnect With a Mentor Author Commented:
I also found an article "Determining why a ESX/ESXi host was powered off or restarted" The link is below:
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1019238
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Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
Re seat the memory, and test the memory with Memtest86+.

Has any hardware changed.
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BusbarConnect With a Mentor Solutions ArchitectCommented:
have you checked the HW and the logs to see what is going on, it is maybe HW faults
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dongocdungAuthor Commented:
I just reseated the memory. I will run the test tonight. I have not changed any hardware. Thanks,
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dongocdungAuthor Commented:
I just found that the host is not rebooting. The host is disable (greyed out) and displays as Not Responding.
Please give me some ideas. Thanks
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Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
Power Off the Host. Restart.
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dongocdungAuthor Commented:
I did that but it still happened again.
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piyushranusriConnect With a Mentor System Cloud SpecialistCommented:
please look in to log files..
and if possible share
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dongocdungAuthor Commented:
What log files do I need to look at?
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dongocdungAuthor Commented:
I found the solution in the article
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