Server constantly lost network connection.

Issue

• When we go to console, and "service network restart", the network then will be enabled for a while. However, after a period of time, the server lost network connection, and can't be reachable by ping again.
• Connectivity is lost frequently with link up and down events seen in the logs:

var/log/messages:Jul 31 12:43:23 hostname kernel: mlx4_en: eth2: Link Up
var/log/messages:Jul 31 12:43:23 hostname kernel: mlx4_en: eth2: Link Down
var/log/messages:Jul 31 12:43:23 hostname kernel: mlx4_en: eth2: Link Up
var/log/messages:Jul 31 14:16:55 hostname kernel: mlx4_en: eth0: Link Down
var/log/messages:Jul 31 14:16:56 hostname kernel: mlx4_en: eth3: Link Down
var/log/messages:Jul 31 14:16:56 hostname kernel: mlx4_en: eth1: Link Down
var/log/messages:Jul 31 14:16:56 hostname kernel: mlx4_en: eth2: Link Down