eth0: transmit timed out

[Josef Kohout]

Zdravim,
v logu na routeru se objevila zprvu ojedinela hlaska:
May 16 08:22:57 router5g kernel: NETDEV WATCHDOG: eth0: transmit timed out
May 16 08:23:00 router5g kernel: eth0: link up, 100Mbps, full-duplex, 
lpa 0x41E1
to se opakovalo:
May 16 10:38:54, May 16 10:39:09
a po serii:
May 16 13:02:31, May 16 13:02:46, May 16 13:47:49, May 16 13:48:04, May 
16 13:48:19, May 16 13:48:34, May 16 13:48:49, May 16 13:49:04, May 16 
13:49:19, May 16 13:49:34, May 16 13:49:49, May 16 13:50:04 ...
v 13:50 interface eth0 tohoto routeru neodpovedel na ping nadrizenemu 
serveru a ten to resetoval.
Pote je jiz vse OK.

Jedna se o "maly" router, eth0 je RTL-8139/8139C/8139C+, UTP kabel ma 
asi 20m, zakladni deska Tiga TI-810+S, krome sitovek zadny dalsi HW, 
distribuce "consolova" FC5,  kernel-2.6.16-1.2111_FC5.i686

Netusi nekdo co mohlo byt pricinou? Nestkali jste se nekdo s "kernel: 
NETDEV WATCHDOG: eth0: transmit timed out"?

Josef