Why was my BitLocker activated?

Could you please clarify why my BitLocker encryption was suddenly activated? I understand it's a security feature designed to protect my data, but I didn't manually initiate the process. Could there be a potential security threat on my device that triggered this automatic activation? Alternatively, is there a possibility that a recent software update or system change inadvertently caused the BitLocker to engage? I'd appreciate any insights you can provide to help me understand this situation better.