Ethernet Card Problem

Hi,
I have problem about Ethernet Card.We built a software ,running on
mini2440,sending-getting information about every 6-8 seconds.For a while it
runs without any problem.But after time passes(not certain period),pda
disconnects network, isnt able to send packets,ping or run other network
activity.how can we override this problem?
thanks

Have you searched the forum for DM9000 problems?  There have been sporadic
issues with long term throughput that people have experienced and
supposedly fixed.

Good luck!