There is no reason to believe that the AI will have self-preservation or self-replication as its goal.
One hypothetical example: it decides to "help" us and prevent any more human pain and death, so it cryogenically freezes all humans. now its goal is complete so it simply halts/shuts-down
One hypothetical example: it decides to "help" us and prevent any more human pain and death, so it cryogenically freezes all humans. now its goal is complete so it simply halts/shuts-down