Yes MoonStar I have seen this. Usually if you give them some fruit or candy when they're working on their career, their interest picks back up again. If they stop working before making some money, keep placing them back to work on their career with praise. They can get over this setback and enjoy working again. In fact, I have found that the peeps who enjoy working usually live longer.
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WARNING: I cannot be held responsible for the above as apparently my cat has learned how to type.