Server constantly down at mid-5am...why??

Hello,

My server is constantly down this week at 5:20am - 5:50am
I checked the /var/log/messages, /etc/httpd/logs/error_log

they both seems 100% fine, I stopped all cron job done by clients
...what is funny here is...the day I announce to customer that I will switch off during that time, the server didn't go down!

Could anyone find the source the problems?

Regards

 

 

 

 

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