Wifi signal continues to sleep after computer wakes up.

if i let my computer go to sleep when i come back and "wake it back up" the wifi signal can not be found. My computer prompts me to "network diagnostic" when i do searchs for 5 mins + sometimes
-50%- it finds the wireless networks around my house like my neighbors ect. any suggestions how to fix this problem im having????
i never, had this problem with my old powerbook g4-other wireless units work just fine so it obviously isnt my router.

I am having the same problems that you described. MacBook early 2008, 2.2 GHz, C2D w/ 4 GB RAM and 10.5.5. When waking from sleep, the MacBook cannot connect to my WPA protected WiFi network. Two iMacs (also C2D), one eMac, one older MacBook (2.0 GHz CoreCuo) and a 1.5 GHz G4 Powerbook have no problems whatever. I repaired the user rights, I reset everything, I reconfigured my WiFi network. Still, the MacBook is playing hard to get. Only when I deactivate WPA encryption do I get a signal, albeit with a noticeable delay.
I saw a similar complaint on a German user forum (www.macgadget.de) today, and that prompted me to look here for similar experiences. Seems like a problem in the early 2008 MacBooks?
The Airport Card is a Broadcom (who came up with that name???), Firmware Version BCM43xx 1.0 (5.10.38.9), set on Channel 11.
There is another thread on the same problem. I admit to posting in duplicate.

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