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update ur airport with the 005 airport update...and if u can! change the channel on ur router...i put my channel to 5! and its workin a treat!! let me know how it goes...

please note this is a suggestion...it worked with me. so i thought i would share it with everyone!
 
Great! I have a Belkin router, by my airport card was dropping the signal every 5 minutes. I fixed it by setting it to a dedicated channel instead of auto. That fixed it for me. I don't know if anybody else was having a problem with Belkin routers, but that's what I did.
 
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