I play on Android and If it takes longer that 15-20 seconds for me to be able to "tap to continue" I will shut down the app completely and start over. That usually does the trick for me.
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I play on iPad 2 (iOS 7) and I usualy restart the app several times before it shows "tap to continue" and I'm almost always logged out. I'm thinking of trying to log out myself everytime before I quit! I'll try and write here result. Anyway thanks for reaction.