So I had this annoying problem with my Vodafone Home Gateway HG659 where none of the wifi passwords would work. I enter the correct password and promoted with the "Incorrect Password. blar blar blar". I would reboot it and everything was okay.
But now the problem is happening every 3~4 days. I would be quite happy watching YouTub and I would be unable to connect the server I tried changing from the 5Ghz to the 2.4Ghz "Wrong Password". Reboot, fixed.
The problem is affecting the Xbox / Chromecast / laptops as well.
I this a known issue? I do have the guest wifi feature enabled and this is also affected.