Could this be linked to Game Centre, my wifi has sometimes been unstable, but if clicking out of the SE app, wifi is usually ok.
At this point clicking back to the app will either do one of two things - no connection, so loose the game, the countdown timer unstoppable or -
Game centre will welcome me back and game will resume, I may delete Game centre as I've had a few random crashes since 1.5 has been released - every time wifi connection fine out of the App, so frustrating and it abused my rating every time
Edit - I only play on IPad.
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