ZWO 1600 - PC crashing at -20

[AbsolutelyN]

My 1600mm pro (or SGP) occasionally goes completely unresponsive or crashes when cooled to -20 and it becomes impossible to warm it back up or it's totally disconnected. I'm not sure on the cause, it's running on a 20m usb3 cable which I suspect could be the culprit. Query is is it likely to damage the camera if the PC crashes when it's at -20? I assume the camera is left to warm to ambient in an uncontrolled fashion. 

[spillage]

I think you might be right that the cable is the cause. I am sure that it is the cooling process that needs to be controlled so you do not shock the sensor but cooling should be okay...I may be wrong.