AE works fine, connected to internet but AE Utility loses base station

three computers are connected, one with ethernet cable (1st gen iMac G5) and two wirelessly (1st gen MacBook Pro and 17 in iMac Core Duo 2)
All three have connectivity to web but the amber light is flashing and NONE of three computers AE utility can find the base station. Earlier today they could, nothing has been restarted. Furthest is 5 meters away and all have max signal strenght.
Do they lose connectivity from AE to base when they sleep and cannot get it back?
Any ideas

How long ago did you set up your wifi system? When you set it up did you replace and existing Airport wifi system? And, if you did, you should have named it something different than the original system and use a different password.
Make sure that you are using the Airport Utility from the disk that came with the 802.11n Extreme and not the old Airport Admin Utility.
When there is wireless connectivity and the amber light is flashing that is usually because no level of security was set when the system was built. The problem is that the new Airport Utility could help you by telling you why the amber light is flashing, but since you can't scan for the base station you can't get to the base station summary tab to check.

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