I kept getting an authentication error when trying to connect to my WiFi even though I was connected to it till a few days ago.
My other devices were still connected too it. So, I knew it wasn't my router. Here's what helped me:
- In the WiFi screen, I selected the menu icon.
- Selected Advanced settings
- Clicked on WPS push button
- I pushed the WPS button on the front of my router and it instantly connected
Hopefully this helps someone!