Unable to access server

[mastermanv222]

I recently updated my iPhone 5s to iOS8, and once I had done this my Simpsons Tapped Out stuffed up.

It now only works when I use my 3G/4G and doesn't work using WiFi. I will use all my data very quickly if I can't fix this.

I have tried deleting the game and reinstalling but this doesn't work. I also reset all network setting and this didn't work. 
It doesn't work on anyone's WiFi not just my own.

Pls help