Traffic drops when reaching to ~110 Mbps
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Take a look at 16:00 and 18:00, traffic drops significantly.
I have a 4 websites on a single server (Cent OS, Apache, MySQL)

do you have any idea how to solve this?

I tried to check Apache error_log, /var/log/messages and I couldn't find anything about that.

any ideas?

![Traffic graph][1]


  [1]: http://i.stack.imgur.com/sX3aK.png