occasionally 10% ping lost in network for a short period

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http://serverfault.com – We are managing like 350 servers, in couple of different cabinets. Sometimes for a certain period of time we lost 10% of pings and session drops with a whole cabin. It is obivous that there is no problem with servers because problem starts with all servers within the cabinet at the same time and ends again at the same time. (We are monitoring servers with a dedicated server in one those cabinets) In addition to this we read 80 mbits of traffic which we believe is not natural. But interestingly after midnight when traffic should be around 20 mbits, we read 80 mbits when this problem occur, and (HowTos)