Airport Extreme randomly disappearing from Airport Utility

Dear All,
We've got here 32 AirPort Extreme Basesations, all with firmware 7.5.2. They are setup for Radius via Server Admin and linked to the OD Master. The basestations work fine except that they drop randomly from the list of basestations in the Airport Utility. They appear to work fine however it's very frustrating that remote access gets lost from time to time. The only solution then is to go under the ceiling and restart them. The units are configured identically and have it's own hostname defined via DNS and the tickbox is on for remote access via Bonjour.
Does anybody has seen this? Especially if configured via Server Admin to authenticate via Radius?
AirPort Extreme has no console login either, that would enalbe us to remotely login and restart the device.
Thanks,
Alex

I had the same problem. I figured out what the problem was when I answered the phone while I was using the computer. My 2.4ghz phone matched the freq with the AirPort, and it killed it every time the phone was on. It took me a few months before I figured it out. Try making a call when you can see the signal meter on the computer. If you don't have a 2.4ghz phone, ask your neighbor. It could be their phone.

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