Sporadic Wireless Failure Persisting across Restarts

I've been reading through all the various wireless problems threads and while a few sound similar to the problem I'm having I think I only found one that's the same - and I'm not sure that one got resolved.
Here's the problem:
Sporadically, sometimes several times a night, sometimes not for a whole day, my iMac will lose its wireless connection. This usually happens in stages - first I still appear to have a wireless connection to my router, but no actual internet connection. At this point my router is always the only one in the list of displayed routers, even though I know there are many more I can usually see. After a while I lose signal completely (or I turn off and back on wireless, which has the same effect). At this point, no wireless networks show up in the list. After a while, I'll see some networks again, but usually not my router immediately. Then sometimes it will show up again, but I'll get an error connecting to it. This state persist a random amount of time, across turning on and off wireless, sleeping the computer, rebooting the computer, changing network settings, anything. Wired networking works fine during this time. Then at some point it'll snap back, connect (usually automatically, unless I change settings) and everything will be peachy until the next episode.
Notes:
- I don't have speed problems when things are working
- I never have the problem of the machine finding the network when waking up from sleep unless it's lost the network before
- this happens on all wireless channels and with varying distances to the router. Interference robustness setting does not matter.
- this persists across different routers (the Verizon Westell model and a linksys WRT54GL both with the latest linksys software as well as with some other downloadable firmwares)
- None of the latest apple updates seem to change the behaviour significantly
- None of the extensive setting changes I've made seem to change this behaviour
- router resets don't seem to matter
- the behaviour is so random that I'm not sure how to demonstrate it to a service person - by the time I get to them the machine will likely have a network connection and might work for a day thereafter
- other machines (two powerbooks) usually do not have the same problem and stay connected to the router just fine. Now, I've had instances where one of the other machines is also unable to connect during this time.
- using iStumbler when the machine is in its broken wireless state I can see my router, but iStumbler will refuse to display a graph for it, always jumping to another available network.
Having a really hard time pinning this one down. Maybe a slightly unseated or faulty wireless card? That doesn't explain why sometimes the other machines also have this problem, but perhaps that's just a different problem? It's certainly not as persistent or frequent on them as it is on the iMac.
I'm having a hard time believing it's a software problem as rebooting all machines/routers involved does not make it go away.
Anyone know if it's impossible to re-seat the wireless card yourself? If I go to an Apple Store and describe this to them, do you think they'll re-seat or exchange the card for me?
Thanks,
Peter
iMac C2D 24" Mac OS X (10.4.9)

zittergrotte,
Its sounds very similar to a persistent and annoying issue that affected all new C2D iMac owners after the 10.4.8 upgrade and I think I read that, re-installing the 10.4.9 combo update over the incremental software update has cured the problem for some users. Have you tried this as yet?
To all reading: has the wireless connectivity issues that affected so many C2D OSX users after the 10.4.8 update resurfaced in 10.4.9 or is this an isolated incident?
I hvaen't as yet updated to 10.4.9 cause I lost all faith after being stung on 10.4.8; but even after the apparent cure in the Airport Extreme 2007-002 update, I still get a consistently better connection, surfing time / speed on my works Dell Latitude D620 running WXP SP2. The iMac is generally sporadic and slow at best wirelessly whereas the Windows laptop zips along at quite a speed 95% of the time.
Quite disappointing to see a Windows machine so consistently outstrip a Mac so conclusively, but the Airport Extreme drivers just appear to be completely naff.
Luke

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    And, no, we don't even have a landline phone system. Just a couple cell phones here.
    I'm not sure about your question of wireless clients connecting to other wireless clients. I cannot really even get on my wireless network to connect to other wireless clients. For instance, my iPad gives me an "Unable to join the network" dialog.
    I do have two computers talking to each other wired-to-wired through the network. They share a mouse+keyboard via Synergy. I will say I shut down the router overnight and plugged it back in this AM and there was a moment there where I didn't think the wired connection was working, either. But it's been solid throughout the day.
    Thanks again!

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    i have exact same problem with my tx1000... could you please let me know if you resolved this issue?

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