I have a IPC-HFW5241E-Z12E for a license plate reader. I set the zoom under Camera->Conditions->Zoom and Focus. There is no save button so I go back to the Conditions tab and click save. That seems to work as when I refresh the web portal, I still get a sharp image. But then a few days later, it's all blurry with the zoom and focus settings having changed. Why is this happening and how can I prevent this from happening?