Airport loses my network, but not airport extreme signal

Since upgrading to leopard (10.5.1), my wireless network of computers (I am using an imac & mac pro book and a new airport extreme 802.11n base - all of which have worked without problems since networking them 6 months ago), will sometimes not show my own network as a network option in the airport status indicator in the menu bar (this happens sporadically with no apparent regularity). I have 4 bars of airport signal reception and I can even see the networks available around me, but mine will not be there. Usually it will pick it back up if I turn airport off and then reopen it but sometimes I have to restart the whole computer. This doesn't seem to be systemic in that one computer may lose the network while the other is working fine....any ideas. I have seen a lot of postings about wonky airport performance with the new leopard OS, but I couldn't find an answer to this.

Hi, (Sorry this is the first time I've posted on a forum)
I had a similar problem. I had successfully set up a network with 2 window computers, running XP and Vista,and an airport extreme. Works great so long as I don't upgrade the firmware on the basestation to 7.2.1.
Recently I saw the light and purchased an Imac with Leopard and Bootcamp. Couldn't connect to my network. Did recommended changes like turning off IPv6 in the imac's airport utility, and changed the basestation IPv6 mode to local link only. Tried to manually setup DNS server address etc on th imac. Went thru the usual stuff with the Apple helpline. No luck.
Found the only way to connect to the network was to switch off the basestation, get the network diagnostic on the imac to start searching for any networks, then switch back on the basestation. Worked.
Then I read on the forum about trying different radio channels on the basestation, rather than leaving it on the default setting "automatic". I tried Channel 11 and (I guesss it it Xmas!) it works perfectly.
Hope this is of help.

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