MacBooks intermittently having trouble joining old AEBS

I have been using my old (g) AEBS in my office for a few months without problems. However, for the last week or so my two partners and I have experienced intermittent problems joining the network (all using "n" MacBooks). Sometimes we can, sometimes we can't, some times one or two of us can but the others can't - there seems to be no pattern.
Oddly my iPhone and my partner's blackberry can always connect.
Looking at the AEBS logs, when the clients try and fail to collect the log shows:
"Severity:3 Request denied for UDP 5353 to with lifetime 7200 [refused]"
Sometimes the numbers are different (4500 instead of 5353).
Any ideas why this might be happening?

I think the problem was interference - have just scanned using Air Radar (thanks for the poster who suggested that for a different problem I posted) and there were 5 networks on the same channel last time I had the issue - now have found a less crowded channel and things are more reliable.

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I suggest taking a look at this article we have named Troubleshooting Wi-Fi issues in OS X Lion and Mac OS X v10.6 found here http://support.apple.com/kb/HT4628?viewlocale=en_US.
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