In the novel 'Solaris', by Stanslaw Lem, Kris Kelvin notices that the automats are all missing after he arrives on Solaris Station. He questions Snaut about this, but the latter refuses to explain.
It's soon revealed that
The Ocean is manifesting people from the crew's memories, and Snaut can't explain it to Kelvin because he knows that Kelvin will think he's insane. Instead, he has to wait for Kelvin to experience it for himself.
However, Snaut and Kelvin have laid their cards on the table by the end of the book but, as far as I can tell, it's never explained why all the automats were hidden away. Given what we learn about the situation on the station, I can't think of any reason why the little helper bots would be a problem for Snaut or Sartorious.
Did I miss some clue, or was this just never explained? I can barely find a mention of the Solaris automats in Google searches, aside from direct quotes from the novel.
I am working off the 2011 English translation audio book.