Wi-Fi keeps going on and off!

Hi
I have my iMac in my bedroom and away from the modem.
Therefore it is connected to the Wi-Fi.
I also have a MacBook and iPhone. Both connected.
MAybe oone or two months now, The Wi-fi on my iMac switches off and then on by itself.
I know it's the WiFi as the network is still there, and my iPhone still works on the WiFi.
I hovered over the Network icon just now, and saw it actually switch off and on, on the status.
What is this? Is it a fixable fault?
Could it be interference from other networks on the same channel?
Thanks in adavnce

I changed the modem channel being used, and it has been more stable!!

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Wi-Fi keeps going on and off!

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