Wireless sometimes not working: "dhcpcd: wlan0 reject NAK"

HI,
Normaly my wireless works fine (I have a FritzBOX wlan router). But sometimes, when connection, I get this:
dhcpcd: wlan0: reject NAK
The wlan still works for other computers ...
What could cause this problem?
I use the iwl3945 kernel driver for intel wlan card.
Thanks!
Nathan

No, it's not the router. I have the same problem occurring sporadically, but my wired PCs can get to the router and work fine. I have an MSI notebook and have rt2x00pci, rt2x00lib and rt61pci all in my MODULES line of the rc.conf file.
I don't remember when the problem started occurring, but it must have been at least several months ago.
-- Dr. U
A child of five would understand this. Send someone to fetch a child of five. (Groucho Marx)

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