Still having problems

After the last two new updates I have not been able to log on with my google account on my device. It keeps telling me unable to authenticate. I have deleted and reinstalled the app and nothing. I always close down my app. This is really bothering me. I enjoy playing the game and not being able to get on has really made me want to give up on this game.

Kytaria about Pokémon GO, v1.31.0