Airport loses connection with MR814 V2

I have an iBook G4. My Airport loses connection with my Netgear MR814 V2 router. The only way to get it back is to unplug / plugin the router. The connection is ok as long as I'm on the iBook. The problem seems to occur after I've shut the iBook down for the day and then the next day the connection is gone.
I also have my Windows based Dell laptop using the router (wirelessly) and never have this problem.
This is really frustrating. Any ideas would be greatly appreciated!!
Mark
iBook G4   Mac OS X (10.4.6)  

I do not have the answer for you, but I am suffering the same thing with my macBook Pro. After about 15 minutes, I loses the connection, and the airport icon in the menu bar goes transparent. Nothing works to renew the connection except to unplug and re-plug my router. If you hear of any remedy, please post.
Jeff

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    The saga continues... my patience is getting very thin. I've spent hours trying to get this to work and am now naming the companies involved.
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    A call to Orange said that the card had not been fully initialised. So I turn off the phone, Orange make some kind of tweak on their side, and tell me to turn on the phone again. It finds the network - but not for long, a couple of hours later, it reports "Invalid SIM" again.
    Another call to Orange, who tell me the phone may be defective, it cannot reliably read the SIM card. Normally they would replace the phone, but since I bought it from the The Phone House, it's not their responsibility. So the phone house directs me to Orange, and Orange directs me to an Apple store.
    Apple - you are my last hope.

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