No connection to airport

My iMac is working as an airport base and I share the internet with other macs (laptops).
The laptops are set up to connect automatically with the iMac. In general it works fine but sometimes the laptops can see the signal but am asked for the password and they connect. Sometimes I am asked for the password and I am told that a connection faliure has occured and sometimes they don't "see" the iMac signal at all. If in any of these cases I turn off the airport of the iMac and turn it on again things work.
What could be the problem?
Sacha.

Yes, it worked well till about one week ago, maybe it has something to do with the firmware update?
Thank you for your help!

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