Can not connect to game server

I can’t connect to a specific game on my iphone (Klondike). This is a recent issue and started close to the time I upgraded to xFi advantage. I don’t know if it’s related or not. The only way I can play the game at home is by turning Xfinity WiFi off so my cellular data is used instead. I’ve used all my high speed internet through T-Mobile now due to this. All other games, apps, internet browsing, streaming and cable tv work just fine. I’ve tried restarting the router, uninstalling and reinstalling the game and deleting the norton app just in case it’s being blocked. The folks at Klondike don’t have any idea as to why this is happening either. Anyone out there have suggestions?