It's a known issue: http://answers.ea.com/t5/The-Sims-4-Bug-Reports/Maid-stops-coming-after-a-few-days/m-p/3464471
Robots is something that came with an expansion in The Sims 3.
The butler on the other hand is an idea, but, at The Answers HQ we only can help you with problems surrounding your games.
You can leave all your thoughts, ideas, suggestions or even complaints about The Sims at the official 'The Sims' forum.
To post these thoughts, ideas, suggestions or complaints please post on 'The Sims 4 Ideas corner' or the 'The Sims 4 feedback'.
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