MacBook Wireless -- Driving me crazy -- Please help!!

I have a MacBook Core 2 Duo with 2 GB RAM.
Lately (past month) I have been having some problems with my wireless connection (which occurs no matter what wireless network I am using). When I turn on the computer the wireless download speed is fine. Then, after I have been using my MacBook for a while, the speed begins to fluctuate. If I am downloading a file, the progress bar moves along at a normal rate for a little bit and then stops and then it continues to move along again at a normal rate and then stops and this continues until the file eventually finishes downloading. This occurs no matter what application I am using (i.e. Safari, Firefox, Download a file from my iMac over the wireless network, iChat, etc.). The progress stops about every 2 seconds.
The only way to “fix” the problem is to either shutdown and restart or to just restart. Then things work fine again for some time. It doesn’t seem to happen when I am doing any particular thing or using particular software.
I contacted Apple Support and they had me make some changes to the network and wireless settings (i.e. create a preferred network for my wireless connection, delete some network wireless Library files, repair permissions) and then when I rebooted the machine, it was, of course, working fine while I was on the phone. However, later in the day the problem reappeared.
I was using Tiger and upgraded to Leopard on the weekend hoping that it would magically fix my wireless problems but it hasn’t. I have installed all of the updates as well.
I am hoping that this sounds familiar to someone and there might be a fix for it. I have been looking online for an answer for quite some time. Rebooting my MacBook all the time is driving me absolutely crazy!!! Any help would be greatly appreciated.
Cheers.

Hi,
I'm curious... Will there actually be 10.4.11 now that Leopard 10.5 has been released? I am hoping there will be a 10.411, of course. I got my Macbook the last week of May 2007, installed the 10.4.10 update the day I got the machine, and had problems since.
I called Applecare as soon as I was sure it was my Macbook being flaky, not me doing something wrong. That was the fisrt week of June 2007, and Applecare acted like they never heard of anybody having WiFi disconnect problems on a Macbook. The best suggestion from Applecare was to go back to 10.4.9 - not something that appeals to me, as I'd lose the other fixes in 10.4.10.
The results for Leopard 10.5 are mixed. One thread says it doesn't help, but the users in another thread say it fixes the problem. Either way, I'm not too excited about paying US $129 to upgrade the operating system to fix a machine only a few months old.
-Bill

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I am Certified Ora DBA and am stuck, thats a shame
I am going to install and Test Oracle 10g on Vista as my future client will use Just Vista and no othr OS, so there is no OTHER OS options,
I ready all the documentaiotn and release notes and also read that Oracle 10g(10.2.0.3) is certified on Vita Ultimate.
I downloaded the DB which is frm the below link:
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*** It installs but it justdoesn't work properly, PLEASE HEEEEEEELP I am running out of time.
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Hi
Does anyone have any ideas on what the problem could be ? its driving me nuts !!!!
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com.apple.iMovie3.plist
com.apple.iMovie7.plist
com.apple.iMovie8.plist
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