They have now admitted that they are aware of a problem:
We have start receiving reports about this from other players as well . We are aware some players may have lost connectivity to The Simpsons: Tapped Out mobile game and are unable to play. Our team is currently investigating the issue. We greatly appreciate your patience, and are working to get normal access restored as soon as possible.
Thank you for your patience and understanding.
Electronic Arts World Wide Customer Experience
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