SMC SMC2804WBR router, dies whenever I use a SMC SMC2802W card...!?

I have set up my new Wireless network, with one Barricade wireless router
from SMC,
one SMC PCI card, one D-Link PCI card and one D-Link PCMCIA card. My problem
is
that whenever enable my SMC PCI card, the wireless network goes down, after
a little while.
I don't have to do something special, it just dies on complete random(or so
it would seem).


Is this a known problem? What could cause a problem like this? Is the PCI
card faulty? I
have tried flashing the routers BIOS, but that didn't help. I don't use any
"G" features on the
D-Link cards, even though my network is "all g".