It happens to me whenever a building is ready for an action (as in, when the Simpson house is ready for me to collect money). If you don't want to be interrupted, your best bet would be not to tap on Simpson house, Kwik-e-mart, or brown houses right before you start assigning your characters jobs. I'm sure they'll get to this bug soon.
For me this only happens occasionnaly.
Will check out the suggestion it being related to collecting from fast generating cash buildings/houses.
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