Dropping airport connection

When I use iChat with Bonjour IM my AirPort connection drops for some unknown reason. It seems to only happen on my PowerBook and not my girlfriends iMac. We are on the same network too. As well as this problem, we have the problem of not being able to see each others screen names in iChat even though the privacy measures are on "allow all" to see and contact me. Any help?

I am having a similar problem, using an AirPort Extreme (gigabit) with about 15-20 users. Every now and again, the AirPort connection will disappear, reconnecting almost immediately, (almost like the AirPort is restarting itself, though it shows no sign of such in the logs), and when network connections are restoring, Bonjour communication won't really be working. Where there were all the people on our network, only a few will show up, if any of them show up. This does not seem to be a service issue on the workstations themselves, since I can plug into ethernet and have all the other people running iChat show up in the Bonjour list, so it seems to be related to the AirPort Extreme specifically.
If anyone has any insight on how to verify that the AirPort Extreme is routing local mDNS traffic, or things to look for in the AirPort log that might indicate why it's restarting, it would be VERY much appreciated.
Gary

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    Okay, a little history here. I've been a Mac user for 20+ years. I know my way around these machines. I have a Mac Pro and a Mac Book, and when they were running Tiger I had zero problems with Airport connections in either case.
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    Mac OS X doesn't have a clean install option:
    http://discussions.apple.com/thread.jspa?messageID=607614
    So unless you did an erase and install, you can't say you have eliminated any potential hardware issue with your machine.
    Linda P, Astriker, and anyone who does not have a solution for Badlydrawnboy, please start a new topic thread below:
    http://discussions.apple.com/forum.jspa?forumID=1222&start=0
    You'll make it harder to get a solution for them as the causes of wireless failure are many. My FAQ* here below discusses the most common reasons, which have existed since the first version of airport many years ago:
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    - * Links to my pages may give me compensation.

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    null

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    Clare in Chi wrote:
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