My Mac Mini (2011) has always auto-joined networks fine until a few days ago when it stopped auto-joining my preferred WPA2 wifi network when I start it up. When I click
Join Other Network and then
Show networks my wifi appears. When I double click it I have to enter my password than my mac joins it. But the next time I start my Mac, I have to do that again.
How can I get auto-join to start working again?