Strangest problem I have ever had

I have a windows 2000 pro workstation. Every time I start it up, all seems
normal for the first 3 minutes or so. I can get on the internet, browse the
network etc... After a few minutes, or if I try and transfer anything bigger
than about 100k over the network or internet, my networking dies. The
computer loses its IP address and I cant do anything network related without
the thing locking up for a while. Then I try an IPCONFIG /RENEW and it tells
me it cant find the DHCP server although it shows I am connected to the
network. I can restart and everything is fine again for about 3 minutes. I
have tried 3 different network cards, different rooms, etc.. so I know its
something Windows related and not hardware. I watch my services and nothing
is stopping or anything like that. I really am stumped. Any ideas from
anyone would be great.
--
Bill S
.

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