My nexus 4 is not storing new Wi-Fi passwords. Each time I want to connect to a previous connected Wi-Fi I have to re-enter the password. I'm running kit Kat, not rooted. Any help will be appreciated

My nexus 4 is not storing new Wi-Fi passwords. Each time I want to connect to a previous connected Wi-Fi I have to re-enter the password.

I found that in Settings > Backup & Restore everything is checked but Backup account - No account is currently storing backed up data is in gray and i can't do anything about it. In Settings > accounts > google i have everything sync but Movies & TV and photos.

I'm running kit Kat, not rooted. Any help will be appreciated