Ethernet Device Time Out Problem

[Vahric MUHTARYAN]

Hi Everybody, 
 
            Today my 6 FreeBSD Machines goes down unexpactly , I checked it
and I saw that there is a network device timeout problem , I atteched the
device to Cisco Cat 2948 GL3 after the problem I connected it to  Cisco 3750
swtich and there is no problem now , anybody have any experince or knowledge
about it ? any idea _!  
 
Maybe somebody will say there is a arp spoof but there is no footprint like
arp request . 
 
Jan 10 10:40:02 clubber /kernel: fxp0: device timeout
 
Thanks Best Regards 
 
Vahric MUHTARYAN