Do you have a lot of apps running in the background? If you have Location Services enabled on a lot of them, if many have Background App Refresh enabled, if your Mail isn't set to Push, if Notifications are enabled on many, if computers/TV in the house are streaming video/music, perhaps this is sucking on your WiFi and affecting your game. I have noticed when we have numerous devices running I have to disable WiFi on most to play, mostly because we only have 20mbps WiFi. I wonder to what extent this contributes to the "you need internet access" error.
I am also wondering how the severe weather events worldwide are interfering with global Internet.