A couple weeks ago I finally replaced my venerable WRT54GL.
I kept the SSID and password the same, but just to be safe, told my phone (Galaxy S6) to forget the network and manually reconnected to it. However it frequently fails to properly reconnect, such as when I come home from work or being idle overnight.
The wifi networks thing just shows "authentication error", and all it takes to fix it is just toggling wifi off (either from the actual wifi menu or the notification pulldown menu) and back on.
With my old router this happened occasionally, usually in the overnight scenario, but it also had no error message, but it's an every day kind of thing now.
Is there some weird cache i need to blow out or something?