[CentOS] Network issue in CentOS 6.3

Hi Guys,

Just found an issue with CentOS 6.3. The network is getting inaccessible at times. The server has been installed with CentOS 6 and then package upgrade was performed.

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[~]# cat /etc/redhat-release
CentOS release 6.3 (Final)
[~]#
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[~]# uname -r
2.6.32-279.5.2.el6.x86_64
[~]#
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The server is up for most of the time. But the next day when we check the server is inaccessible over network (through SSH). This happens often now.

Do you have any suggestions? Is it a CentOS 6.3 bug?

Regards
Joby