WRT320N & IBM T42 laptop keeps dropping wireless connection at key times

I have an IBM T42 laptop whihc keeps dropping the wireless connection at what seems to be the same time windows each day.
I have my cable modem connected to my WRT320N.
My wireless it set up as follows :
Manual configuration
Wireless Band = 2.4Ghz (Think it needs to be this for the T42 wireless).
Network Mode = Mixed
Channel Width = 20Mhz only
Channel = 2
It seems to be that at approx 8pm each night when using the latop downstairs, the wireless connection will drop and then fail to reconnect for a period of time. I reboot the laptop and it will then begin to work again. The wireless connection does seem to keep trying to connect but it cannot maintain the connection to the router.
Any ideas?

Well I've pretty much given up trying to get this router to work so have spoken to the supplier I bought it off who said it's now discontinued by Linksys - all support is through them now. Took it up with them went through all the steps I've done to try and troubleshoot it (helps to be an IBM engineer as I logically follow procedures through).
I've RMA''d the router and hope it's replacement works better. I've just unbricked my old WRT54GS to make do whilst I wait for a replacement - back down to 100mb traffic - I'll miss my gigabit switch for a while!

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