NIC stops working suddenly

Hi lis,

I have a RHEL 3 update 4 OS, my NIC suddenly stops working and there is no
lights flushing (green and orange) if i leave the server for a while (like
one hour). But when i do service network restart, life goes back to NIC and
all the lights flushing normally and ping works great, but also after a
while the NIC dies again.... it needs service network restart every while.

I checked system logs --> kernel: tg3: eth0: link is down.
I also checked the /etc/modprobe.conf, alias eth0 tg3
I had no network-manager service

is it hardware problem or there is something that just froze the NIC or
what??

I really appreciate your help

Regards
Mohammad

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