Why was Sophia the robot shut down?

Can you explain the reasoning behind the decision to shut down Sophia, the robot? Was it due to technical issues, ethical concerns, or perhaps a lack of practical use? Was there a specific incident that led to this decision, or was it a gradual realization that Sophia was no longer serving its intended purpose? It would be interesting to understand the thought process behind this decision and what it means for the future of robotics and AI.