WRT320N : Keep needing to re-connected wireless lan

Hi
I have a problem with a WRT320N that is wirelessly connected to a windows 7 PC using a WUSB600N network card.
As soon as I boot the PC, everything works fine. Then after about 30 secs I lose connection to the router. If I disconnect and re-connect the wireless network in windows and everything is then fine until next time I reboot the PC (or it wakes from sleep) and then the same thing happens.
Can anyone think whats causing this?I am assuming its related to the DHCP reservation but cannot work out why this is occuring.
The router has the latest firmware (1.0.04). The router is set to Wireless-N only, and the PC has a DHCP reservation.
The information that appears in the logs everytime is as follows:
>>
Tue, 04 Jan 2011 21:02:17 Found static leases pair : MAC 00:25:9C:E0:61:41 , IP 192.168.1.2
Tue, 04 Jan 2011 21:02:17 received REQUEST from 00:25:9C:E0:61:41
Tue, 04 Jan 2011 21:02:17 sending ACK to 192.168.1.2
Tue, 04 Jan 2011 21:02:21 Found static leases pair : MAC 00:25:9C:E0:61:41 , IP 192.168.1.2
>>
Grateful for any help
Thanks
Chris

Well I am using Wireless N so its only 36,40,44 or 48 for the channel options.
I changed the Beacon interval, RTS and fragmentation thresholds as you suggest but it made no difference.
The same thing also happens whether the PC is connected with a cable, so I don't think the wireless settings are of any consequence.
I really need to get to the bottom of what the log message REALLY means.
What does 'found static leases pair' really mean?
It thinks it has given the same IP out to 2 cards?
Is it not recognising the MAC properly?
Its issing the IP twice?

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WRT320N : Keep needing to re-connected wireless lan

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