This might sound stupid, but does the camera spin on its own if you power it up while the st16 is switched off?
Im just wondering if the switch on the controller that sets the camera horizontal mode is set to constant speed instead of position, and the knob isn't centred. If so, the camera would just start spinning as soon as the control link is established (long before wifi connects and the image appears).
I have actually done this before and had a moment of panic, so I thought it might be worth asking in case it's that silly