Why does Kindle fail to connect to wifi?

A

AC Question

why does Kindle fail wifi connect

but other devices here (laptops, cellphones, Roku, tablets) all connect and stay connected to my wifi router? Wifi used to work on the KF but now it fails to connect to my router. This router is a Buffalo WZR600DHP, a very fine unit which runs DD-WRT.
And don't suggest rebooting/resetting the router.. That is for dummies. Besides it disconnects other active devices which is RUDE.
 

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