Tg3 problem

Dear All,

I have problem at my server. At /var/log/messages

bonding: bond0: link status definitely down for interface eth1, disabling it
 tg3 0000:03:00.1: eth1: Link is up at 100 Mbps, full duplex
 tg3 0000:03:00.1: eth1: Flow control is off for TX and off for RX
: tg3 0000:03:00.1: eth1: EEE is disabled
 bond0: link status definitely up for interface eth1, 100 Mbps full duplex.
 tg3 0000:03:00.1: eth1: Link is down
 bonding: bond0: link status definitely down for interface eth1, disabling it
 tg3 0000:03:00.1: eth1: Link is up at 100 Mbps, full duplex
 tg3 0000:03:00.1: eth1: Flow control is off for TX and off for RX
 tg3 0000:03:00.1: eth1: EEE is disabled
 bond0: link status definitely up for interface eth1, 100 Mbps full duplex.
 tg3 0000:03:00.1: eth1: Link is down
bonding: bond0: link status definitely down for interface eth1, disabling it
 tg3 0000:03:00.1: eth1: Link is up at 100 Mbps, full duplex
tg3 0000:03:00.1: eth1: Flow control is off for TX and off for RX
 tg3 0000:03:00.1: eth1: EEE is disabled
 bond0: link status definitely up for interface eth1, 100 Mbps full duplex.

uname -r = 2.6.32-279.el6.x86_64
modinfo tg3 = 3.122

Why the eth1 always down every 5 minutes?

Regards
Marry Jane