There's your problem. You updated iOS to 8.0. Should have waited for 8.1 or 8.2. iOS is alway broken with a new update.
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Tell me about it, I don't ever use Apple, so didn't think twice. Just thought the changes they make I won't care cause I won't know what they were like before. Little did I know.
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You could try reinstalling the app. That works about 70% of the time.
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I must be apart of an unlucky 5%. I thought genius, re-install the app. So I did. Unfortunately, it still sends me back out the app, but this time it signs me out too. Not to worry I'm sure it'll sort itself out.