10.4.11 airport intermittent

MacBook 2 gHz which was running 10.4.10. First applied delta update manually. Airport signal indicator goes to gray every 5 seconds or so and loses connection. Re-booted in 10.4.10 from a clone and airport works perfectly.
Tried applying Combo Updater and repairing permissions, removing appropriate plist files, resetting SMC - no luck.
Any ideas? Thanks in advance.
-dan

Also I have the exact same problem.
I have a quick work around which is not great but does get me onto a wireless network.
I changed my wireless LAN back to unsecured from secured and I connected fine no drop outs whatsoever. As soon as I changed back to Secured Wireless the problem came back. I also tested this with a different Wireless ADSL router and same results as above. Ruled out ADSL hardware at fault.
Maybe someone with little more tech savvy can take this forward to a complete resolution. My ability ends here!!!
I am not transferring sensitive data or have visable shares. Does leave me open I know but I need to work ;-(
Bill

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    64 bytes from 192.168.1.201: icmp_seq=5 ttl=64 time=3953.169 ms
    64 bytes from 192.168.1.201: icmp_seq=6 ttl=64 time=3142.803 ms
    64 bytes from 192.168.1.201: icmp_seq=12 ttl=64 time=532.846 ms
    64 bytes from 192.168.1.201: icmp_seq=13 ttl=64 time=2.933 ms
    64 bytes from 192.168.1.201: icmp_seq=14 ttl=64 time=2.637 ms
    64 bytes from 192.168.1.201: icmp_seq=15 ttl=64 time=3.920 ms
    64 bytes from 192.168.1.201: icmp_seq=16 ttl=64 time=873.117 ms
    64 bytes from 192.168.1.201: icmp_seq=18 ttl=64 time=120.166 ms
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    64 bytes from 192.168.1.201: icmp_seq=20 ttl=64 time=25.360 ms
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    64 bytes from 192.168.1.201: icmp_seq=26 ttl=64 time=3.148 ms
    64 bytes from 192.168.1.201: icmp_seq=27 ttl=64 time=15.083 ms
    64 bytes from 192.168.1.201: icmp_seq=28 ttl=64 time=9.760 ms
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    64 bytes from 192.168.1.201: icmp_seq=34 ttl=64 time=10436.977 ms
    64 bytes from 192.168.1.201: icmp_seq=36 ttl=64 time=8741.888 ms
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    64 bytes from 192.168.1.201: icmp_seq=39 ttl=64 time=5953.356 ms
    64 bytes from 192.168.1.201: icmp_seq=40 ttl=64 time=5052.035 ms
    64 bytes from 192.168.1.201: icmp_seq=41 ttl=64 time=4052.752 ms
    64 bytes from 192.168.1.201: icmp_seq=42 ttl=64 time=3078.099 ms
    64 bytes from 192.168.1.201: icmp_seq=43 ttl=64 time=2080.547 ms
    64 bytes from 192.168.1.201: icmp_seq=44 ttl=64 time=1256.154 ms
    64 bytes from 192.168.1.201: icmp_seq=45 ttl=64 time=354.956 ms
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    64 bytes from 192.168.1.201: icmp_seq=47 ttl=64 time=195.729 ms
    64 bytes from 192.168.1.201: icmp_seq=48 ttl=64 time=322.706 ms
    64 bytes from 192.168.1.201: icmp_seq=49 ttl=64 time=162.115 ms
    64 bytes from 192.168.1.201: icmp_seq=50 ttl=64 time=266.209 ms
    64 bytes from 192.168.1.201: icmp_seq=51 ttl=64 time=93.211 ms
    64 bytes from 192.168.1.201: icmp_seq=52 ttl=64 time=7.915 ms
    64 bytes from 192.168.1.201: icmp_seq=53 ttl=64 time=17.481 ms
    64 bytes from 192.168.1.201: icmp_seq=54 ttl=64 time=94.742 ms
    64 bytes from 192.168.1.201: icmp_seq=55 ttl=64 time=20.951 ms
    64 bytes from 192.168.1.201: icmp_seq=56 ttl=64 time=7.534 ms
    64 bytes from 192.168.1.201: icmp_seq=57 ttl=64 time=4.164 ms
    64 bytes from 192.168.1.201: icmp_seq=58 ttl=64 time=2.394 ms
    64 bytes from 192.168.1.201: icmp_seq=59 ttl=64 time=71.640 ms
    64 bytes from 192.168.1.201: icmp_seq=60 ttl=64 time=95.045 ms
    64 bytes from 192.168.1.201: icmp_seq=61 ttl=64 time=9.422 ms
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