Airport seems to be scanning almost all the time

Hi
I have searched the forum and not sure if my issue is part of a wider software problem. The symptom is that the Airport gives a message on both my iMAc and MacBook Airport:scanning. It then finds the network shows Airport: on but then very quickly starts to scan again. I have 5 bars for signal strength.
So my question is this a problem I have and needs fixing or more general one waiting for Apple?
Thanks

It should only scan when you select the AirPort drop down menu. Anytime you do this it is going to scan for wireless networks in case you want to connect to one that has come online or gone offline since the last scan. That doesn't mean it is always scanning, it just means it is scanning anytime you use the drop down menu. This is normal.

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