USB ethernet device stops working...

eth2      Link encap:Ethernet  HWaddr 00:E0:4C:53:44:59  
          inet addr:192.168.4.2  Bcast:192.168.4.15 Mask:255.255.255.240
          inet6 addr: fe80::2e0:4cff:fe53:4459/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:807400 errors:215794 dropped:1116 overruns:236
frame:3625
          TX packets:859301 errors:3432 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:155489213 (148.2 MiB)  TX bytes:155534045 (148.3 MiB)

Note that there are errors and a lot of them.  This is a USB dm9601
variety ethernet device.  One curiosity of mine is why the txqueuelen is
set to 1000 when this is only a fast ethernet device?  Restarting the
device makes it work for a while, but that is not a solution to whatever
the problem is.  I have three of these USB ethernet cards where only one
is doing this.  I'm baffled by this.  Failures happen consistently, I
bet the card only works for a half an hour or so.  Well, it is 5:30 and
I got the device working again by restarting the network.  Question is,
what is the underlying problem and why does a restart fix it?

[admin <at> goose64 ~]$ ip route list|sort
10.0.0.0/24 via 192.168.5.6 dev eth0 
127.0.0.0/8 dev lo  scope link 
192.168.0.0/24 via 192.168.5.6 dev eth0 
192.168.3.0/27 via 192.168.5.1 dev eth0 
192.168.3.0/27 via 192.168.5.4 dev eth0 
192.168.4.0/28 dev eth2  proto kernel  scope link  src 192.168.4.2 
192.168.4.16/28 dev eth3  proto kernel  scope link  src 192.168.4.18 
192.168.4.32/28 via 192.168.4.17 dev eth3 
192.168.5.0/24 dev eth0  proto kernel  scope link  src 192.168.5.3 
207.55.87.32/28 dev eth1  proto kernel  scope link  src 207.55.87.35 
default via 207.55.87.33 dev eth1 
[admin <at> goose64 ~]$ 

Hmm, I just changed the routing table so that the route to
192.168.3.0/27 is via 192.168.5.6 instead of offering two 
hosts for the same network with no metric specified. Hopefully, 
that will help.

What follows is a snippet from lsusb showing the USB ethernet cards.

Bus 001 Device 022: ID 0fe6:9700 Kontron (Industrial Computer Source /
ICS Advent) DM9601 Fast Ethernet Adapter
Bus 001 Device 071: ID 0fe6:9700 Kontron (Industrial Computer Source /
ICS Advent) DM9601 Fast Ethernet Adapter
Bus 001 Device 024: ID 0fe6:9700 Kontron (Industrial Computer Source /
ICS Advent) DM9601 Fast Ethernet Adapter

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