FC3 e100 link lost under load. Help please!

I have an FC3 machine with an Intel eepro100 adapter. The problem is
that whenever the network load is high, connectivity is suddenly lost.
Here's what the logs typically look like:

Feb 11 13:08:14 S network: Bringing up interface eth0: succeeded
Feb 13 11:43:42 S kernel: e100: eth0: e100_watchdog: link down
Feb 13 23:50:45 S kernel: e100: eth0: e100_watchdog: link down
Feb 15 10:01:23 S kernel: NETDEV WATCHDOG: eth0: transmit timed out
Feb 15 10:01:23 S kernel: e100: eth0: e100_watchdog: link up, 100Mbps,
full-dupl
Feb 15 22:24:54 S kernel: e100: eth0: e100_watchdog: link down
Feb 16 22:11:21 S kernel: e100: eth0: e100_watchdog: link down
Feb 17 15:22:02 S kernel: NETDEV WATCHDOG: eth0: transmit timed out
Feb 17 15:22:02 S kernel: e100: eth0: e100_watchdog: link up, 100Mbps,
full-dupl
Feb 17 18:48:12 S kernel: e100: eth0: e100_watchdog: link down

Kernel is 2.6.12-1.1381_FC3smp, but the problem has occured with
previous kernels as well.

00:0a.0 Ethernet controller: Intel Corporation 82557/8/9 [Ethernet Pro 100]
(rev 08)
Subsystem: Intel Corporation EtherExpress PRO/100+ Management
Adapter

PCI devices found:
Bus 0, device 0, function 0:
Class 0600: PCI device 1106:0691 (rev 196).
Prefetchable 32 bit memory at 0xfe000000 [0xfe3fffff].
Bus 0, device 1, function 0:
Class 0604: PCI device 1106:8598 (rev 0).
Master Capable. No bursts. Min Gnt=8.
Bus 0, device 4, function 0:
Class 0601: PCI device 1106:0686 (rev 64).
Bus 0, device 4, function 1:
Class 0101: PCI device 1106:0571 (rev 6).
Master Capable. Latency=64.
I/O at 0xd800 [0xd80f].
Bus 0, device 4, function 4:
Class 0600: PCI device 1106:3057 (rev 64).
IRQ 9.
Bus 0, device 10, function 0:
Class 0200: PCI device 8086:1229 (rev 8).
IRQ 169.
Master Capable. Latency=64. Min Gnt=8.Max Lat=56.
Non-prefetchable 32 bit memory at 0xf7800000 [0xf7800fff].
I/O at 0xb800 [0xb83f].
Non-prefetchable 32 bit memory at 0xf7000000 [0xf70fffff].
Bus 1, device 0, function 0:
Class 0300: PCI device 5333:8a13 (rev 2).
IRQ 11.
Master Capable. Latency=64. Min Gnt=4.Max Lat=255.
Non-prefetchable 32 bit memory at 0xf8000000 [0xfbffffff].

The machine connects to an Intel 510T switch. No other devices connected
to that switch have had any issues.

Any thoughts or ideas?

DS