Keep having an issue with my home wifi. Often have to reconnect because of an authentication error. I've tried forgetting the network and resetting it but it hasn't solved the problem.
Hmmm... What is the make and model of your router? Is it dual band? If so, try connecting to the 5.8GHz band. Also, are you on an area with a lot of WiFi networks, like an apartment complex.
I'm still of the opinion it is the router and not the phone.