Base Stations regularly stop responding

This college has 9 Airport Extreme Base Stations. Two of them have the WAN port attached to our ethernet network. One of these is set up as a Main Base Station for a WDS, linking to 2 relay stations and on to the remotes. They all have fixed IP addresses (10.0.1.x) and are in bridge mode - clients get their ip addresses from our Xserve (OS X server 10.4.4). They are all on Channel 10 and have WEP security set so that only students with the password on their computers can get wireless access.
When it's all working, it works very nicely. Students can talk to each other, form little PC workgroups and have internet access through the ethernet. Typically we might have a total of about 30 machines accessing at any time.
Regularly (sometimes 3 or 4 times a day) a base station stops responding. Its central light is lit, but there is no activity, students lose contact, and I cannot see it from Airport Admin on the server. I haven't noticed any particular pattern as to which station goes down. It seems it can happen to any of them. Updating from firmware version 5.6 to 5.7 has made no difference - six hours later two went down with the log of the relays they were attached to showing it had happened within a minute of each other. I could not see anything in the relay's log to indicate what might have preceded the failure.
All the stations are powered locally. Switching off and on again restores the connection perfectly - until the next time.
Does anyone have any idea what could be causing this?
Martin

I too have an AEBS which goes dead intermittently. Sometimes it works fine for a week then it will go dead every morning. I just have too run upstairs and unplug the power for 30 seconds and it works just fine for 24 hours or more. I don't have any answers just want you to know that misery loves company.
I assume something is failing and I will have to send it back to Apple for repair but would like to confirm this is the case. And yes I have done a hard reset (unplug it, press the little button on the back and hold it for 30 seconds) but did not solve the problem.
Tom
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Hi DanielleB,
Welcome to Apple Discussions
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Base Stations regularly stop responding

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