How can i stop my computer from losing the wi-fi link

My computer keeps "losing" the wi-fi in my home and making me sign in over and over.  It recognizes the network and doesn't require me to give the password for the network, but it asks me for the password required to make network changes.  It has done this for a couple of years now.  It is inconsistent.  About half the time, it works fine, but then it will say your preferred network is not available.  Then it will show that network as the only one available and require the password for making network changes again.  I have gone into the network utility and "locked" it after making the changes, but it doesn't make any difference.

If it's happening after a period of shutdown and a startup, then try only sleeping the Mac Mini instead of shutting it down. (Besides, sleeping a Mac is easier on the hardware and perfered over shutting down)
For example: my Mac's only get shut down when I go away for more than a couple of days and can sleep for weeks without any problems.

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