On Mon, 20 Mar 2017 14:53:09 +0100, Carlos E. R. wrote:

Instead, I tap "more options", which displays the same list of SSIDs in
white background instead of black. There I switch off the WiFi, than on
again, and it instantly connects to my WiFi remembering its password.

This behaviour started about last November or December.

As I recall, my WiFi used to scan and show all the WiFi networks, and for
those that I tapped on, it would first ask for the password and then always
remember it from thence forward.

Now, it won't even scan, and yet, other apps (like Fritz WLAN) see the AP
SSIDs quite clearly, and, if I *connect* to the network once manually into
Android WiFi settings, then it remembers it from thence forward.

Funnily, if I don't connect, then it won't remember neither the SSID nor
the passphrase, which is odd to say the least.

Anyway, my next factory refresh should solve whatever setting it was that
screwed it up. I screw with Android settings often so this is just a nit in
the scheme of things. I just don't understand why as what Jeff noted is
good but I don't think it applied to my situation (which itself,
admittedly, is different than most since I screw with settings all the
time).