Lost signal on Airport Extreme after return from sleep

Everyday I lost my Airport signal after my computer turn on sleep for a long time.
but no prb at all if I work on it... 2,3,4 8hres
after "wake-up", impossible to "reactivate" ANY connexions !!!
Only a full restart of my computer solve this prb :-(((
Do you have any ideas ?
- firmware ?
THX, Denis
AirPort Card Information:
Wireless Card Type: AirPort Extreme
Wireless Card Locale: USA
Wireless Card Firmware Version: 405.1 (3.90.34.0.p18)
Current Wireless Network: PRIVATE
Wireless Channel: 6
Hardware Overview:
Machine Name: PowerBook G4 15"
Machine Model: PowerBook5,2
CPU Type: PowerPC G4 (1.1)
Number Of CPUs: 1
CPU Speed: 1.25 GHz
L2 Cache (per CPU): 512 KB
Memory: 1 GB
Bus Speed: 167 MHz
Boot ROM Version: 4.7.1f1
Serial Number: V7349D2XNRZ

I've found the prb !!!
go into system preferences and delete all the locations that were using airport.
Then go into keychain (utilities) and delete any airport passwords.
Turn the m/c off amd back on again and start from scratch.
All is now fine.
Denis

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hardware is turned off. That includes the Airport
hardware. When you wake it up it has to establish a
new connection. The problem that you are having
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has worked since day 1 (10 months ago). It does not
matter if it was sleeping or completely off. I end
up clicking on retry for up to 30 times to get it to
connect. This is only true if I am using the
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supplied to the Airport hardware is different when on
AC power or the AC power cord is acting as a
supplemental antenna. I have tried all of the
"fixes" reported here and none of them have done
anything to solve the problem. I am using WPA
security. It is not a case of a corrupted key since
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Windows XP under Bootcamp always connects immediately
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Hi Retired Engineer
My brand new apple computer behaves exactly as you describe it. My wife's notebook PC with WInXP does not.
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