wireless WPA disconnection issues

[Riccardo Mottola <riccardo.mottola%libero.it@localhost>]

Hi,

I have an issue when trying to remain connected to a WPA network.
I use wpa_supplicant and dhcpcd (I suppose that's the only way?). 
Connection happens fine, but after a certain while.. sometimes minutes, 
sometimes hours, I loose connection.

I need to kill wpa_supplicant and dhpcd and relaunch them and everything 
works again.

I noticed that every time I have an issue, I see in my dmesg:

iwi0: unknown authentication state 1


Dmesg says about my iwi:

iwi0 at pci1 dev 2 function 0: vendor 0x8086 product 0x4220 (rev. 0x05)
iwi0: interrupting at irq 11
iwi0: 802.11 address 00:0e:35:60:1a:48
iwi0: 11b rates: 1Mbps 2Mbps 5.5Mbps 11Mbps
iwi0: 11g rates: 1Mbps 2Mbps 5.5Mbps 11Mbps 6Mbps 9Mbps 12Mbps 18Mbps 
24Mbps 36Mbps 48Mbps 54Mbps

Anyone has similar issues? what could be the problem?

Thanks,
Riccardo