Poweredge 6650 RHEL3 Network Issues

Here is the scenario, hoping someone can help:

Product Name: PowerEdge 6650

Bios Version: A17

# OS/Hardware information

# redhat-release
Red Hat Enterprise Linux AS release 3 (Taroon Update 5)

# uname -a
Linux uprrdb004 2.4.21-32.ELsmp #1 SMP Fri Apr 15 21:17:59 EDT 2005 i686 i686 i386 GNU/Linux

# lspci
08:01.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5700 Gigabit Ethernet (rev 14)

# errors in /var/log/messages
messages.4:Sep 30 09:56:42 uprrdb004 kernel: NETDEV WATCHDOG: eth0: transmit timed out
messages.4:Sep 30 09:56:42 uprrdb004 kernel: tg3: eth0: transmit timed out, resetting
messages.4:Sep 30 09:56:43 uprrdb004 kernel: tg3: eth0: Link is down.
messages.4:Sep 30 09:56:46 uprrdb004 kernel: tg3: eth0: Link is up at 1000 Mbps, full duplex.
messages.4:Sep 30 09:56:46 uprrdb004 kernel: tg3: eth0: Flow control is off for TX and off for RX.
messages.4:Sep 30 09:57:24 uprrdb004 network: Shutting down interface eth0:  succeeded
messages.4:Sep 30 09:57:30 uprrdb004 network: Bringing up interface eth0:  succeeded
messages.4:Sep 30 09:57:32 uprrdb004 kernel: tg3: eth0: Link is up at 1000 Mbps, full duplex.
messages.4:Sep 30 09:57:32 uprrdb004 kernel: tg3: eth0: Flow control is off for TX and off for RX.

We are having network connectivity issues.  As you can see by the above messages there is a timeout issue.  Any ideas would be more than welcomed.  I have tried pci=noacpi in grub but to no avail.  Time is limited on this box as it is production and cannot be taken down to frequently.