Mysterious Network Outage

New iMac about two weeks ago although I don't think it's part of the problem. My home Airport wifi network has been in place for almost five years with no problems. Two Airport Expresses - one main and one "slave" connected to my stereo to play iTunes music.
About the time the iMac went in (replacing early iMac G5 without camera), the network started to act up. It would just stop working for no apparent reason, two or three times a day. If I launched Airport Admin Utility to try to troubleshoot, most of the time it could not detect either of the Airports when it scanned the network. (This was true if I ran Airport Admin Utility on the iMac or on my MacBook.) Sometimes if I turned off the Airport card on the iMac and turned it back on again it would fix things, but usually not. Most of the time, if the network was detected when I did that, it would ask for the network password, and then wouldn't accept the correct password when I'd enter it.
If I clicked the "show password" box on the login dialog, what I saw was puzzling: if the correct WEP password was "ABC" the password that showed was "3A3B3C." The password is the correct length - this is just an example. Don't know where the 3s are coming from, but it's always 3s and that always seems to be the cause of my not being able to get back up and running.
The fix, ultimately, is to unplug the main Airport Express, wait a second, and plug it back in and wait for it to restart and reconfigure. Once that's done, the other one comes back online and everything is fine until it all happens again.
I have completely reconfigured both Airport Expresses from their factory settings a couple of times. Everything works fine for a while and then it doesn't - all for no reason that I can point to. The guys at the Apple Store say that there shouldn't be any issue with the older Airport Expresses and the newer iMac/Mac OS, although I have noticed that when the network is out the iMac is "usually" asleep - but this isn't always true either.
Has anyone had any similar experiences? I'm not a network expert but I think I know enough to keep my little network running well enough to do what I need it to do, and this is thoroughly frustrating, especially not being able to "reboot" the routers with the Apple utility that's meant for just that purpose. If it can't see the devices, what's the problem?

Leopard in my opinion plays much nicer with WPA/WPA2 networks. WEP is insecure and you should upgrade your network security anyway. Try configuring your base stations with WPA/WPA2 passwords.

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    ----- Ping.txt -----
    Microsoft Windows [Version 6.1.7601]
    Copyright © 2009 Microsoft Corporation. All rights reserved.
    C:\Users\Administrator>ping 192.168.1.1
    Pinging 192.168.1.1 with 32 bytes of data:
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    Request timed out.
    Request timed out.
    Request timed out.
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    Reply from 192.168.1.253: bytes=32 time<1ms TTL=128
    Reply from 192.168.1.253: bytes=32 time<1ms TTL=128
    Reply from 192.168.1.253: bytes=32 time<1ms TTL=128
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    Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
    Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
    Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
    Ping statistics for 127.0.0.1:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
    Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 0ms, Average = 0ms
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    TCP [fe80::9142:b19d:a6d0:d31d%14]:135 WORK-SERVER:35353 ESTABLISHED
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    TCP [fe80::9142:b19d:a6d0:d31d%14]:389 WORK-SERVER:6686 ESTABLISHED
    TCP [fe80::9142:b19d:a6d0:d31d%14]:389 WORK-SERVER:6687 ESTABLISHED
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    TCP [fe80::9142:b19d:a6d0:d31d%14]:389 WORK-SERVER:6765 ESTABLISHED
    TCP [fe80::9142:b19d:a6d0:d31d%14]:389 WORK-SERVER:17256 ESTABLISHED
    TCP [fe80::9142:b19d:a6d0:d31d%14]:389 WORK-SERVER:17327 ESTABLISHED
    TCP [fe80::9142:b19d:a6d0:d31d%14]:389 WORK-SERVER:19074 ESTABLISHED
    TCP [fe80::9142:b19d:a6d0:d31d%14]:389 WORK-SERVER:19075 ESTABLISHED
    TCP [fe80::9142:b19d:a6d0:d31d%14]:389 WORK-SERVER:19077 ESTABLISHED
    TCP [fe80::9142:b19d:a6d0:d31d%14]:389 WORK-SERVER:19896 ESTABLISHED
    TCP [fe80::9142:b19d:a6d0:d31d%14]:389 WORK-SERVER:19902 ESTABLISHED
    TCP [fe80::9142:b19d:a6d0:d31d%14]:389 WORK-SERVER:24754 ESTABLISHED
    TCP [fe80::9142:b19d:a6d0:d31d%14]:389 WORK-SERVER:36936 ESTABLISHED
    TCP [fe80::9142:b19d:a6d0:d31d%14]:389 WORK-SERVER:36944 ESTABLISHED
    TCP [fe80::9142:b19d:a6d0:d31d%14]:389 WORK-SERVER:36946 ESTABLISHED
    TCP [fe80::9142:b19d:a6d0:d31d%14]:389 WORK-SERVER:41165 ESTABLISHED
    TCP [fe80::9142:b19d:a6d0:d31d%14]:389 WORK-SERVER:56317 ESTABLISHED
    TCP [fe80::9142:b19d:a6d0:d31d%14]:389 WORK-SERVER:56319 ESTABLISHED
    TCP [fe80::9142:b19d:a6d0:d31d%14]:389 WORK-SERVER:59239 ESTABLISHED
    TCP [fe80::9142:b19d:a6d0:d31d%14]:389 WORK-SERVER:59243 ESTABLISHED
    TCP [fe80::9142:b19d:a6d0:d31d%14]:389 WORK-SERVER:59244 ESTABLISHED
    TCP [fe80::9142:b19d:a6d0:d31d%14]:389 WORK-SERVER:59245 ESTABLISHED
    TCP [fe80::9142:b19d:a6d0:d31d%14]:389 WORK-SERVER:59258 ESTABLISHED
    TCP [fe80::9142:b19d:a6d0:d31d%14]:389 WORK-SERVER:59262 ESTABLISHED
    TCP [fe80::9142:b19d:a6d0:d31d%14]:389 WORK-SERVER:59263 ESTABLISHED
    TCP [fe80::9142:b19d:a6d0:d31d%14]:389 WORK-SERVER:59327
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    I have noticed currently using the Cisco Gigabit switch the network will last 24-48 hours.
    3th April
    I have tested a 10/100 16port netgear and the network lasted for 5+ Days.
    8th April
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    Either the modem is causing this. Or its the server nic running at only 100mbps
    Does it make any sence?
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    From my post do you think the port on the gateway is flaky? As you said maybe too much for it to handle.
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    Thankyou
    Cheers

    Make sure you have the latest ROM bios and proliant support pack.
    http://h20566.www2.hp.com/portal/site/hpsc/template.PAGE/public/psi/swdHome/?sp4ts.oid=3948599&spf_p.tpst=swdMain&spf_p.prp_swdMain=wsrp-navigationalState%3DswEnvOID%253D4064%257CswLang%253D%257Caction%253DlistDriver&javax.portlet.begCacheTok=com.vignette.cachetoken&javax.portlet.endCacheTok=com.vignette.cachetoken
    Install the rom bios, then easiest to boot the HP smartstart to prepare for operating system deployment, then install the complete PSP next.
    Regards, Dave Patrick ....
    Microsoft Certified Professional
    Microsoft MVP [Windows]
    Disclaimer: This posting is provided "AS IS" with no warranties or guarantees , and confers no rights.

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