Airport dropping signal?? can't find it unless I restart

I have an imac, it's only a week old. bought it as a refurb.
I ran some recommended updates, and within the day, the signal from wireless internet drops randomly (? i think) and then my computer won't recognize my server/signal unless I restart, then it works fine for a while til it drops.
?? any ideas would be helpful.
imac efi firmware update 1.1is the update that I suspect, only because shortly after I ran that update, I started having the problem. I don't know what the efi firmware 1.1 is.
imac 1.83 intel core duo Mac OS X (10.4.8)

I think I'm having a similar problem. My AirPort Extreme base station (802.11g) will "disappear." My airport menu shows that I'm still connected to the network, but when I open the AirPort admin utility, the base station does not appear. I hit the "rescan" button a few time, nothing. The only way I can get it back is to power-cycle the base station. I have 3 macs in the house and when the base station disappears, none of them can find it. My AirPort Express flashes amber indicating it too has lost the connection with the "main" base station. I've gone so far as to do a hard reset of the AirPort Extreme base station. Last night I changed the channel it's operating on, we'll see if that helps. Any clue as to why it would just drop off like that?
24" iMac Intel Core 2 Duo Mac OS X (10.4.8)

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I've been having the same problem as most of the people in this forum right now. Dropped or weak airport signal, even though your sitting right next to the router. People have seemed to attributed the problem to firmware updates on the card or the basestation. It happened to me right when I updated to 10.4.4 and the APEX to 6.3, right around the time of Macworld.
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I actually tried that a while back, but no luck. It doesn't seem to be an issue with my basestation. I know alot of people have had fixes when they downgraded firmware in their Airport Extreme Base Stations, but for me, its and issue with my Powerbook.
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the dropped connection is irritating, but im more
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attempt to reconnect, airport can't find the linksys
router. it tells me this in an error message. THEN,
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what is going on? is airport finding one of my
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Interference can cause dropped connections. Like your phone; see below. Or your neighbor's phone. Or your neighbor's WiFi on the same channel.
A utility called iStumbler may be of help to see if there are other strong WiFi signals on the same channel as you.
http://www.macupdate.com/info.php/id/11753
I have seen some posts that a firmware update on the router solved some connection dropping problems.
oh, and one more thing. when i dial my cordless phone, my connection drops.
Some cordless phones operate on the same frequency as WiFi. You can try changing your Airport channel, trial and error. (Airport Admin Utility) My phone is like that, and there's no way to set which channels the phone uses. I settled on Channel 11 for my Airport.

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Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
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Hello out there
I have a BIG problem ..
I have for some while ago, bought a TC and used it with no problems for some month while i have had a wi-fi at home ..
Now, I don't have the wi-fi connection anymore - i use my iPhone for sharing, so the settings for the TC are not working anymore..
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Please help me ..

So your main internet is via a tethered connection with the iphone.. or wifi from the iphone??
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With simultaneous connection to two different networks now working properly try again to connect to the TC hard disk in TM.. if it fails. reset tm as it can get messed up.
See A4 http://pondini.org/TM/Troubleshooting.html
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