15" MacBook Pro randomly loses connection to my AirPort Express wi-fi network.

My 15" MacBook Pro randomly loses connection to my AirPort Express wi-fi network. I have to switch off wi-fi on my Mac then switch on again to reconnect. Any reason why this random occurrence keeps happening which never happened before? Any solutions and fixes would also be welcomed.
Jazz

In the airport utility, you can alter the radio modes... and change the channels from automatic to a manual one.
Hold down the Option key, and  click on your wifi icon, it will tell you what channels are currently being used on your OSX.

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