Acer Iconia One 7 WIFI Issue?

In WiFi advanced turn of WiFi optimization.

I too have an Iconia One 7 and it likewise refused to remember WiFi passwords.  I spent a fair amount of time trying various solutions proffered by various users (the problem can be found in a number of Android forums and is not isolated to this device).

Only one solution worked for me:

1) I performed a factory reset on the tablet, and

2) During tablet initialization, I chose a different device name.  For example, my previous device name was "Joe User" and during init I opted for "User Family".  These names are fake, but you get the idea.

Now my tablet remembers the WiFi password after it wakes up from sleep and after a restart (no special WiFi setting change required).  There is apparently a "scenario" (bug :-) ) that causes the file which stores WiFi passwords to either become corrupt or readonly.  Once this file becomes "wedged", your choices are to root the device (become admin) and fix the file or just start over (factory reset).

Nota Bene:  it goes without saying that you'll lose all installed apps and user-created data (pics, contacts, etc.) during the factory reset.

Hope this helps.