Airport signal being blocked

I control a network of 50+ wired Mac and a handful of wireless users. My wireless users have two Airport Extremes that are located too far away for a WDS setup. One day a few weeks ago both bases stopped working. Both exhibited the same issue where the people logged into them were seeing their signal strength on their PowerBook's flash from full bars to nothing, somewhat just flickering on and off. I thought that it could be related to a big show that was located in the convention center that they are attached to. When I spoke to the networking company that runs the wiring and networks for the convention center I was told that they didn't do anything. The next day one of the Airports was back to behaving normal. The second one didn't get plugged back in until today, when it was it exhibited the same issues as before. When I pulled it out of it's location and took it down the hall to where the other base station was it worked fine. When it goes back to it's home it flickers, even on my known good PowerBook that just connected to it moments before.
My question, is someone intentionally blocking my base stations? How would they go about that? I believe the convention center's network guys did something accidentally, but it appears they may not be smart enough to undo it. I think they are flipping switches in the back and got lucky when they fixed the first one.

Two suggestions:
1. make sure both base stations are running firmware version 5.5.1 and not version 5.6. Check this with the Airport Admin Utility, and if necessary get version 5.5.1 from:
http://www.apple.com/support/downloads/airportextremefirmware551formacosx.html
2. radiofrequency interference will easily cause the problem you have noted, and that interference can come from many sources including neighboring wireless networks and 2.4GHz portable phones. You can minimize this interference by experimenting with trying to find a clearer channel - try first either channel 1 or 11. If the Base Stations are in close proximity to each other, make sure they are assigned channels at least three channels apart. The channel setting selection is made under the Airport tab of the Airport Admin Utility.

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