Internet connection (sometimes) slow to come back after wake up

Hi all,
I started having a strange problem few days ago. First time it happened my husband gave the iBook back to me after using it, and I logged into my user account - and internet connection was gone. I checked the airport settings, the bars were there - went and checked internet connection from the other computer and it was ok. Rebooted, twice, fiddled with the internet connections - and suddenly, without changing anything, the connection was back.
So I though it was weird, but since my iBook has been fine since I got it 7 months ago I didn't think more of it. Then it happens again - this time I opened it up from sleep, and again no internet connection, couldn't even contact the router although bars were there and it claimed that it was connected to the network. This time I didn't even change the settings, but just looked at them, and after 5 minutes or so the connection came back. Then it happened again, same symptoms and same solution - wait for 5 minutes and it will sort itself out. But of course it doesn't happen every time - yesterday it was fine.
Anyone has any ideas what's going on, and possibly even solve the issue?
Any help would be appreciated.
12" iBook G4   Mac OS X (10.4.3)  

Hi.
Sorry that the simple fix doesn't do it. There are other things you can try, since WiFi can be cranky in many ways. First, are you running an Airport base station or some other wireless router? If it is "other", then you might try changing the broadcast channel on it. WiFi operates on 11 different channels in the 2.4 MHz band, and you might get more reliable connections on a different channel.
The Airport base station is smart enough to switch itself to the best channel, but you may have to do your own adjustments with other routers. Most use channel 6 by default; if you are in a neighborhood with lots of other WiFi access points around all running on channel 6, you can get significant interference. Try switching to channel 1 or channel 11. Other devices in the 2.4MHz band can also be a problem: garage door openers, cordless phones, or baby monitors.
Note your own router could have strong signal, but it would be fighting all the other signals coming in. If you are in an apartment building or in a block of houses fairly close together, such noise could be an issue. My neighbor was having WiFi connection outages, and it turned out that he had five detectable signals from his neighbors, all but one running on channel 6 along with him (I was on channel 3).
The location of your router can also be important. According to experts on the web, it is better to have your base station higher than your iBook. My neighbor had another strike against him when he put his base station into the basement while he tried to work in the bedroom above with a laptop.
Anyway, there are many things that can go wrong. You may indeed have a hardware problem, but let's rule some more easily fixable problems first.
Good luck.

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